The Quinnipiac University Poll shows the former Vice President with 39% support among registered Democrats, far ahead of Bernie Sanders in second, with 13%, Kamala Harris and Elizabeth Warren with 8% each, Pete Buttigieg with 6% and Cory Booker with 5%.
In a head-to-head matchup for the general election, Biden has an 11-point lead over Trump, 53 to 42.