Big Democratic field taking shape for 2020 U.S. presidential race

The largest Democratic field in the modern political era is lining up to seek the party’s 2020 presidential nomination - and is expected to keep growing.

The diverse group vying to challenge President Donald Trump, the likely Republican nominee, includes six 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 became the party’s nominee. 

Here are the Democrats who have launched campaigns or are expected to pursue a presidential bid, listed in order of their RealClearPolitics national polling average for those who register in opinion surveys.

JOE BIDEN