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In the United States, the Electoral College is the group of presidential electors required by the Constitution to form every 4 years for the sole purpose of appointing the president and vice president. Each state appoints electors under the methods described by its legislature, equal in number to its congressional delegation (representatives and senators). The federal District of Columbia also has 3 electors under an amendment adopted in 1961. Federal office holders, including senators and representatives, cannot be electors. Of the current 538 electors, a simple majority of 270 or more electoral votes is required to elect the president and vice president. If no candidate achieves a majority there, a contingent election is held by the House of Representatives to elect the president and by the Senate to elect the vice president.
The states and the District of Columbia hold a statewide or districtwide popular vote on Election Day in November to choose electors based upon how they have pledged to vote for president and vice president, with some state laws prohibiting faithless electors. All states except Maine and Nebraska use a party block voting, or general ticket method, to choose their electors, meaning all their electors go to one winning ticket. Maine and Nebraska choose one elector per congressional district and 2 electors for the ticket with the highest statewide vote. The electors meet and vote in December, and the inauguration of the president and vice president take place in January.
The merits of the electoral college system is a matter of ongoing debate in the United States, which came closest to switching to direct voting for president in 1969–70 (a transition all other democratic countries with electoral colleges for the executive head of state have made). Supporters argue that it requires presidential candidates to have broad appeal across the country to win, while critics argue that it is not representative of the popular will of the nation. Winner-take-all systems, especially with representation not proportional to population, does not align with the principle of "one person, one vote". Critics object to the inequity that due to the distribution of electors, individual citizens in states with smaller populations have more voting power than those in larger states. This is because the number of electors each state appoints is equal to the size of its congressional delegation, each state is entitled to at least 3 regardless of its population, and the apportionment of the statutorily fixed number of the rest is only roughly proportional. This allocation has contributed to runners-up of the nationwide popular vote being elected president in 1824, 1876, 1888, 2000, and 2016. In addition, faithless electors may not vote in accord with their pledge. Further objection is that candidates focus their campaigns on swing states.