Warren left the race without endorsing Biden or her fellow progressive Bernie Sanders — but the dynamics changed substantially in subsequent weeks, with campaigning forced into a hiatus amid the coronavirus outbreak.

Biden leaned heavily on his affiliation with the former president throughout the Democratic primary, framing his pitch as an extension of Obama's presidency.

As Michigan and five other states hold presidential contests on Tuesday, Sen. Bernie Sanders faces a critical point in the Democratic race following Joe Biden's Super Tuesday victory a week prior.

Warren's exit extinguished hopes that Democrats would get another try at putting a woman up against U.S. President Donald Trump.

Super Tuesday is the biggest day on the primary calendar, and the results seem very likely to reshape the Democratic presidential race in ways few people could have predicted a couple of weeks ago. Here are some takeaways from the results.

Super Tuesday marked a striking collapse for the onetime darling of progressives who was known for having a plan for nearly everything.

Sen. Bernie Sanders is looking for an early home-state win in Vermont, and polls began closing in some of the 13 other states voting from California to Maine.

Vermont Sen. Bernie Sanders began the day as the Democrats' undisputed presidential front-runner, backed by a coalition of energized liberals, young voters and Latinos.

The share of late deciders ranged from about one-third of voters in North Carolina to roughly 40 per cent in Massachusetts, according to AP VoteCast surveys of voters in several Super Tuesday contests.

More than a third named health care, an issue that has intensely divided the field of Democratic candidates.