Exit polls

Since 1988 when frontloading a significant number of states on a single day became popularized in the GOP primary, it has been decisive in determining the nominee.

Fox News and The Associated Press, which NPR relies on, were the earliest to call Arizona for Biden. Other networks didn't follow for days, as Biden's lead shrank dramatically and some doubted the AP.

Fox News and the Associated Press are upending a quarter century of how elections are measured — and races called — launching a new approach for this fall's midterm elections.

Younger Asian-Americans are more likely to cite unequal treatment by police than older generations, according to a survey of Asian-American voters who are also split on the issue along ethnic lines.

Men, voters in key counties and white people — particularly less-educated whites — helped Donald Trump vault past Hillary Clinton to win the presidential election.

Women, Hispanics and (surprise!) white evangelicals could be some of the most interesting storylines of the night.

In 2012, whites without a college degree were far more likely to vote Republican. They are a shrinking part of the electorate, but their influence is growing in GOP primaries.