In a new poll from Quinnipiac University on Tuesday, New York City Mayor Bill de Blasio is polling at 0% and has the highest unfavorability rating among the more than 20 Democrats running in the 2020 presidential election.

While de Blasio's favorability rating is similar to candidates like Montana Gov. Steve Bullock, Colorado Sen. Michael Bennet, and California Rep. Eric Swalwell, the reason why their numbers are lower is because the vast majority of voters have not heard enough about them to form an opinion.

In contrast, 45% of voters have an unfavorable view of de Blasio, with only 8% viewing him favorably. 48% of voters still have not heard enough about him to form an opinion.

[Related: Mayor Bill de Blasio: NYC is going to ban 'glass and steel skyscrapers']

Other candidates polling at 0% include New York Sen. Kirsten Gillibrand, former Colorado Gov. John Hickenlooper, and Ohio Rep. Tim Ryan.

Former Vice President Joe Biden leads the Quinnipiac poll at 35%. Vermont Sen. Bernie Sanders is second at 16%, and Massachusetts Sen. Elizabeth Warren is in third at 13%.

[Also read: NYC cops call Bill de Blasio ‘unmitigated disaster,’ Trump calls him ‘a joke’]