(CNN) Former Vice President Joe Biden is out front in a poll by Quinnipiac University out Thursday, with 29% of Democrats and Democratic-leaning voters saying they'll vote for him in the 2020 primary if he runs.

Biden is contemplating a campaign for the White House in 2020, and there is speculation that he is close to entering the presidential field.

He is followed by Vermont Sen. Bernie Sanders (19%), former Texas Rep. Beto O'Rourke (12%), and Sen. Kamala Harris (8%), according to the Quinnipiac poll.

"Hungry for a candidate to take on President Donald Trump, Democrats and Democratic leaners put the three B's, Biden, Bernie and Beto, at the top in a race where age, race and gender take a back seat to electability and shared views," said Tim Malloy, assistant director of the Quinnipiac University Poll.

Others such as Sen. Elizabeth Warren (4%), South Bend Mayor Pete Buttigieg (4%), New Jersey Sen. Cory Booker (2%), and Minnesota Sen. Amy Klobuchar (2%) got above the 1% mark.

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