Kalyani Saxena

For nearly 30 years, Arizona has been a steady and unassailable red.

The Republican stronghold last voted for a Democrat for president in 1996 when Bill Clinton was reelected. Donald Trump won Arizona in 2016 by 4 points. And yet this year, despite a tight contest, The Associated Press and other news outlets including CNN, The New York Times and The Washington Post, have all called Arizona for Joe Biden.