Factbox: More Democrats enter 2020 U.S. presidential race

U.S. Democrats, anxious to get started on their quest to recapture the White House in 2020, are lining up to launch campaigns in what is quickly becoming a crowded field of presidential contenders. A diverse group that includes at least six U.S. senators will be vying for the right to challenge President Donald Trump, the likely Republican nominee, who could face a long-shot primary challenger. Here are the Democrats who have either launched campaigns or formed exploratory committees to begin raising money and hiring staff for a presidential run: CORY BOOKER - Booker, 49, a black second-term senator from New Jersey and former mayor of Newark, gained prominence in the fight over Brett Kavanaugh's Supreme Court nomination.