The field of Democratic presidential candidates is starting to take shape. In June, 20 of them will participate in the first debates. Get caught up.
Democrats seeking to unseat Republican U.S. President Donald Trump in 2020 will choose from the largest and most diverse set of candidates in history - yet, so far, two older white men are leading the pack. The early dominance of former Vice President Joe Biden, 76, and U.S. Senator Bernie Sanders, 77, is raising uncomfortable questions about whether Democratic voters think a woman or minority candidate has what it takes to defeat Trump, the likely Republican nominee.