1. 20 in 2020.

Former Vice President Joe Biden announced his candidacy for president, framing the election in terms of one question: Which candidate can beat President Trump?

“We are in the battle for the soul of this nation,” Mr. Biden, 76, said in a three-minute announcement video. He is the 20th Democrat to jump in the race.

Mr. Biden, pictured above in Delaware today, is an early front-runner for the Democratic nomination, but the party is quite different from how it was when he first entered politics.