Electoral College
The Electoral College is the indirect system by which Americans elect their president, not through a national popular vote but through 538 state-level electors, with each state allocated electors equal to its congressional representation. A candidate needs 270 electoral votes to win. The system means that presidential elections are decided by a small number of competitive 'battleground' or 'swing' states rather than national vote totals.
Established by the Constitution in 1787, the Electoral College was a compromise between direct popular election and selection by Congress. Under the current system, nearly all states use winner-take-all allocation: the candidate who wins a state's popular vote, even by one vote, receives all that state's electoral votes. This makes the margin of victory in competitive states decisive, while large non-competitive states are effectively irrelevant to the outcome.
The 2020 election illustrates the system's mathematics. Biden won 81 million popular votes to Trump's 74 million, a 7 million difference. But Biden's Electoral College margin was just 65,000 votes across three key states (Arizona, Georgia, Wisconsin). If those 65,000 votes had flipped, Trump would have won with 270+ electoral votes despite losing the national popular vote by 7 million. This is not a hypothetical quirk, in 2000 and 2016, the popular vote winner lost the presidency.
The practical consequence is that presidential strategy is almost entirely built around a handful of battleground states, Pennsylvania, Michigan, Wisconsin, Arizona, Georgia, Nevada, North Carolina. Winning California by 5 million votes or losing Texas by 2 million makes no difference; both deliver their expected electoral votes to the same party. Everything turns on about 15–20 million voters in six or seven states, most of them in suburban counties where college-educated, economically comfortable voters swing between parties based on candidate personality and perceived stability.
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Frequently asked questions
How does the Electoral College work? ＋
The Electoral College is America's indirect presidential election system. Each state has electoral votes equal to its total congressional seats. A candidate needs 270 of 538 total electoral votes to win. Most states use winner-take-all allocation, so winning California by 5 million votes counts the same as winning it by one. Presidential elections are therefore decided by small margins in 6–7 competitive swing states.
Why did Biden win the 2020 Electoral College with only 65,000 votes? ＋
Biden won the national popular vote by 7 million, but the Electoral College margin came down to about 65,000 votes across Arizona, Georgia, and Wisconsin, the states that gave him enough electoral votes to reach 270. If those three states had gone to Trump, Trump would have won the presidency despite losing the national vote by 7 million. That's how swing-state math works.