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One of the unique features of American federalism is the manner in which the President and Vice President are elected: rather than being elected directly by popular vote, the President and Vice President are elected indirectly by the Electoral College.

The number of Electors for each state is equal to the whole number of Representatives and Senators representing each state. In addition, Washington D.C. has three electors in the Electoral College as per the Twenty-third Amendment to the United States Constitution. In all states except Maine and Nebraska, the state’s Electors are instructed to vote en bloc for the President and Vice President in line with the plurality of the popular vote in each state.

This means that the outcome of the Presidential Election depends not on the total popular vote in the United States, but on the popular vote totals in each state. (In Maine and Nebraska, electoral college votes are determined on the basis of the popular vote in each Congressional District, with two at-large electors assigned to support the winner of the statewide popular vote).

In most states, the administration of elections takes place at the county level, so that election results are commonly reported on a county-by-county basis.

The online data book Significant Features of American Federalism aims brings together available federal, state and local-level data on federalism and intergovernmental relations in the United States in order to lower the threshold for evidence-based policy making and research on intergovernmental policy issues. Data tables available on Significant Features relevant to presidential elections include:

In addition to the data resources available on Federalism.US, the United States Elections Project–led by Professor Michael McDonald at the University of Florida–is providing regularly updated early voting statistics by state and county ahead of the 2020 General Elections.