2024 presidential candidates: Who's running, who's out and who to watch

Washington — The 2024 presidential campaign is heating up by the week, as more candidates jump in and others bow out.

Four Republicans so far have launched their campaigns for the party's nomination, while President Biden officially launched his reelection bid with a video released on April 25, exactly four years after he entered the race in 2020.

The field of GOP presidential hopefuls is expected to grow as campaign season revs up, but with the first presidential primary still nearly a year away, a lot can change before voters head to the polls.