Factbox: More than 20 Democrats, two Republicans vie for presidential nomination

The largest Democratic field in the modern U.S. political era is competing for the party's 2020 presidential nomination.

The diverse group of more than 20 vying to challenge President Donald Trump, the likely Republican nominee, includes seven U.S. senators. A record six women are running, as well as black, Hispanic and openly gay candidates who would make history if one of them becomes the party's nominee.