EXPLAINER: How can the AP call races right as polls close?

FILE - "I Voted" stickers are displayed at a polling place in Cheyenne, Wyo. on Aug. 16, 2022. The instant polls close across the country when Tuesday’s Nov. 8, 2022, midterm election ends the Associated Press could declare winners in some races. On election night, the The Associated Press counts the nation’s votes, tallying millions of ballots and determining which candidates have won. It’s been done like that since 1848, when the AP declared the election of Zachary Taylor as president. (AP Photo/Thomas Peipert, File)

The instant polls close across the country Tuesday, The Associated Press could declare winners in some races in this year's midterm elections.

How is that possible, before any results are released? Let's take a look at how the AP can declare a winner before the first ballots are counted.

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