US Presidential and Congressional Elections

The formal rules for becoming president are remarkably thin. Article II of the Constitution sets three qualifications, and the amendments add one restriction.

Requirement	Source	Detail
Natural-born citizen	Article II, Section 1	Citizenship from birth, not by naturalisation
At least 35 years old	Article II, Section 1	Measured at the point of taking office
Resident in the US for 14 years	Article II, Section 1	Need not be continuous
A maximum of two elected terms	22nd Amendment (1951)	Adopted after Franklin Roosevelt won four elections

The calendar is equally fixed. Presidential elections fall every four years on the Tuesday after the first Monday in November, and the 20th Amendment sets the inauguration for 20 January. Donald Trump began his second term on 20 January 2025.

Everything else in this lesson — the invisible primary, primaries and caucuses, conventions, even political parties themselves — appears nowhere in the Constitution. The process has grown up around a document that is silent about it. That silence is the reason the system can be reformed by state legislatures and party rules rather than by constitutional amendment.

The invisible primary is the period between a candidate signalling a run and the first votes being cast in the primaries and caucuses. No delegates are won, but candidacies are made and destroyed.

It is often called the money primary, because fundraising is the clearest measure of strength. Four things are being contested:

• Money. Campaign staff, offices and advertising in early states have to be paid for before a single delegate is available.
• Name recognition. Little-known candidates use televised debates and media appearances to become plausible.
• Endorsements. Backing from governors, senators and interest groups signals to donors that a campaign is viable.
• Poll standing. Debate qualification thresholds are usually tied to polling and donor numbers, so falling behind removes a candidate from the stage.

Worked example — the 2020 Democratic invisible primary (held through 2019). More than 20 candidates entered. Pete Buttigieg, then mayor of South Bend, Indiana, was almost unknown and rose from about 1% to 8% in candidate preferences on the strength of debate performances. Kamala Harris, a sitting senator with a national profile, withdrew in December 2019 — before a single vote was cast — stating that she could not raise the money to continue.

Worked example — the 2024 Republican invisible primary. Four Republican primary debates sanctioned by the party ran from August to December 2023, with a further televised debate in Iowa in January 2024. Donald Trump declined to attend them, yet his standing with the party's rank and file was strong enough that his three main challengers entered the voting stage already behind. The invisible primary had effectively settled the contest before Iowa.

Between January and June of election year, each state holds a primary or a caucus to allocate its delegates to the National Party Convention. Delegate numbers reflect state population.

Type	Who may take part	Example states
Closed primary	Only voters registered with that party	Florida, New York
Open primary	Any registered voter, regardless of party	South Carolina, Texas
Semi-closed primary	Registered party supporters plus independents	North Carolina
Caucus	Party supporters attending a local meeting	Iowa, Nevada, North Dakota, Wyoming

Primaries are formal secret ballots. Caucuses are meetings at which participants discuss the candidates and then register a preference openly, often by a show of hands or a head count. Democratic contests allocate delegates proportionally, which keeps trailing candidates alive; the general election, by contrast, is winner-take-all in most states.

Worked example — the 2024 Republican race. Trump won 51% of the vote in the January 2024 Iowa caucuses, the traditional opening event. Vivek Ramaswamy withdrew that night and Ron DeSantis followed on 21 January, before New Hampshire voted. Nikki Haley fought on until Super Tuesday, when 15 states voted on the same day and she carried only Vermont. That result left Trump as the clear choice of the delegates.

Worked example — the 2020 Democratic race. Buttigieg narrowly won the Iowa caucuses and Bernie Sanders took New Hampshire and Nevada, making Sanders the February front-runner. Joe Biden then won South Carolina, where African American voters made up around 60% of the Democratic electorate and the endorsement of Congressman Jim Clyburn moved opinion decisively. Buttigieg and Amy Klobuchar withdrew and endorsed Biden, who went into Super Tuesday on 3 March, took ten of the 14 states voting, and emerged as the clear winner of the nomination.

The early states matter out of all proportion to their size, because winning them converts into money, media coverage and momentum. But an early win guarantees nothing: Buttigieg won Iowa in 2020 and was out of the race within a month.

The National Party Convention is the meeting at which each party's state delegates formally settle the ticket and the platform. Its stated functions and its actual modern role have drifted apart.

Formal function	What happens in practice
Choose the presidential candidate	Decided by the primaries months earlier; the convention confirms it
Confirm the vice-presidential running mate	Chosen personally by the nominee, with no delegate vote on the choice
Agree the party platform	Genuinely contested, because factions bargain over wording
Unite the party and launch the campaign	Still the main purpose: a scripted television event aimed at voters

2024. Trump was nominated at the Republican convention in Milwaukee in July, two days after surviving an assassination attempt in Butler, Pennsylvania, and announced Ohio senator J. D. Vance as his running mate. On the Democratic side, Biden withdrew on 21 July; Harris was nominated by delegates in early August and confirmed at the Chicago convention, where speakers ranged from the progressive Alexandria Ocasio-Cortez to former presidents Barack Obama and Bill Clinton — a deliberate display of the breadth of the party's coalition.

2020. Both conventions were held largely online because of the pandemic, with even the formal nominations conducted remotely. The choice of official host city still carried a message: the Democrats picked Milwaukee in Wisconsin, a state Trump had narrowly won in 2016, and the Republicans picked Charlotte in North Carolina, another swing state.

The standing criticism is that conventions have become coronations. Pre-scripting removed most of the spontaneity long before 2020, and the virtual format removed the rest.

Voters do not choose the president directly. They choose electors, and the 538 Electoral College votes are distributed between the states according to congressional representation: House seats plus two senators, with three votes for Washington DC under the 23rd Amendment. A candidate needs 270 to win.

Every state except Maine and Nebraska awards its entire bloc to the candidate with the most votes in that state. Because most states are reliably Republican or Democratic, the contest reduces to a handful of swing states.

Worked example — 2024. The seven swing states were Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania and Wisconsin, holding 93 Electoral College votes between them. Trump won all seven.

State	Trump	Harris	Electoral College votes won
Georgia	50.7%	48.5%	All 16 to Trump
Wisconsin	49.6%	48.8%	All 10 to Trump

On the certified national count Trump took 49.8% of the popular vote (77,284,118) to Harris's 48.3% (75,017,613), on turnout of about 64% of the voting-eligible population. That 1.5-point lead became a 312–226 Electoral College margin: under half of the votes cast converted into about 58% of the college. In 2020 the same machinery gave Biden 306 votes to Trump's 232 on the highest turnout since 1900, 66.7%.

The same winner-take-all rule sustains the two-party system. A party that finishes third everywhere wins nothing anywhere, and the cost of ballot access, name recognition and advertising compounds the problem. In 2024 Jill Stein (Green), Chase Oliver (Libertarian) and the independent Cornel West each finished well under 1% of the vote. Robert F. Kennedy Jr, the most prominent independent, abandoned his campaign in August 2024 and endorsed Trump, although his name stayed on the ballot in Wisconsin and Michigan without affecting the outcome.

A sitting president seeking a second term starts from a position no challenger can match.

Advantage	How it works in a campaign
Name recognition	Voters already know the candidate; no introduction is needed
Automatic media coverage	Official duties generate national coverage at no campaign cost
Authority of office	The candidate can act as head of state during a crisis
Ready-made organisation	Staff, data and donor networks carry over from the previous run
Control of the party	Serious nomination challenges are rare and usually short-lived
Fundraising head start	In spring 2020 Trump's campaign held a $72 million lead over Biden's

The advantage is real but conditional, because an incumbent also runs on a record. Since 2000, four presidents have been in a position to seek a second full term: George W. Bush won in 2004 and Barack Obama won in 2012; Trump lost in 2020 after his handling of the Covid-19 pandemic and an unemployment rate that peaked at 15% in April 2020 dominated the campaign; and Joe Biden abandoned his re-election bid on 21 July 2024 after a poor televised debate performance on 27 June and the withdrawal of donor support.

2024 also produced the mirror image of incumbency. Trump ran as a former president rather than a sitting one, and became the first candidate since Grover Cleveland in 1892 to win a non-consecutive second term. He kept the name recognition and the donor network without carrying responsibility for the previous four years — and used the cost-of-living record of the administration he was challenging against its vice-president.

Congressional elections run on their own timetable, and Issue 4 of the specification places them in this section alongside the presidential race.

	House of Representatives	Senate
Size	435 members	100 members, two per state
Term	Two years	Six years
Elected	All seats, every two years	About one third of seats, every two years
Districts	Single-member districts redrawn after each census	Whole state

Every second congressional election falls in the middle of a presidential term. These midterms are usually harder for the president's party: Trump lost control of the House in 2018, which allowed his first impeachment in December 2019, and the Democrats lost the House in 2022 while holding the Senate.

Sources of the incumbency advantage:

• Constituency service. Casework for individual constituents builds a personal vote that is hard to dislodge.
• The franking privilege. Members may send official mail to constituents at public expense.
• Fundraising. Interest groups and PACs prefer to fund likely winners, so money follows the sitting member.
• District boundaries. House districts are redrawn after each decennial census, mostly by state legislatures, and both parties draw safe seats where they can.

The result is that studies of recent cycles routinely find over 90% of House incumbents seeking re-election are returned. Senate rates are lower and more variable, because a whole state is harder to make safe than a district.

Worked example — 2024. Republicans took the Senate 53–47 and held the House 220–215, producing unified government for the 119th Congress (2025–27). Part of the explanation is the coat-tails effect: congressional candidates benefiting from their presidential nominee's national performance, with Republican gains in West Virginia, Ohio and Montana clinching the Senate.

The next midterms fall on 3 November 2026. Republicans will be defending 22 of the 35 Senate seats contested, and the House majority is narrow enough that a small number of losses would flip control.

1. Describing the process instead of assessing it

The 30-mark command word is Evaluate, and 10 of those marks are AO3. Set out the case that the process is democratic — mass participation in primaries, open candidate selection, federalism protecting small states — against the case that it is not, then say which is stronger and why.

2. Saying the Electoral College is undemocratic without evidence

Give the mechanism and a figure. In 2024 a 1.5-point popular vote lead became a 312–226 college margin, and margins of about two points in Georgia and under one point in Wisconsin delivered entire blocs.

3. Confusing primaries with caucuses

A primary is a secret ballot run like an election. A caucus is a meeting where preferences are registered openly. Only a handful of states use caucuses.

4. Forgetting that congressional elections are now part of 5.1.1

Issue 4 moved congressional elections and the significance of incumbency into this section. An answer on elections that covers only the presidency has left out assessable content.

5. Treating the invisible primary as unimportant because no votes are cast

It eliminates candidates. Harris withdrew in December 2019 without a vote being taken, and the 2024 Republican field was effectively settled before Iowa.

6. Writing about the 2026 midterms as though they have happened

As of September 2026 they are still to come, on 3 November. Write about them in the future tense, and use 2024 for evidence about outcomes.