Mayor Bill de Blasio could be forced to turn out the lights on his long-shot presidential bid, according to a new survey released Tuesday.

De Blasio did not even register with voters — garnering less than 1 percent support in the latest Quinnipiac University poll of Democratic presidential candidates.

Another New York candidate, Sen. Kirsten Gillibrand, also failed to register 1 percent in the poll.

That puts both New York candidates in danger of failing to qualify for the next round of Democratic presidential primary debates that will be held on Sept. 12-13.

Candidates have until Aug. 28 to both receive contributions from at least 130,000 unique donors and crack 2 percent in at least four major polls.

The stricter requirements will separate the contenders from the pretenders — and without free air time, as many as 10 candidates might have to consider dropping out.

The Quinnipiac poll found that former Vice President Joe Biden is still the front-runner, getting support of 32 percent of Democrats despite two shaky debate performances.

Massachusetts Sen. Elizabeth Warren, who has done well in the debates, is backed by 21 percent of respondents, followed by Vermont Sen. Bernie Sanders with 14 percent and California Sen. Kamala Harris with 7 percent.

South Bend, Indiana, Mayor Pete Buttigieg gets 5 percent and New Jersey Sen. Cory Booker and former US Rep. Beto O’Rourke have 2 percent each.

There are four candidates with 1 percent each and 14 candidates at less than 1 percent each.

Biden, who served as former President Barack Obama’s No. 2, maintains strong support among black voters. Nearly half of black voters are with Biden — 47 percent — followed by 16 percent for Sanders, 8 percent for Warren and 1 percent for Harris.

He has a big lead among moderate/conservative Dems, but Warren leads among very liberal voters with 40 percent, followed by Sanders with 20 percent.

These findings compare to results of a July 29 survey by Quinnipiac showing Biden with 34 percent, Warren with 15 percent, Harris with 12 percent and Sanders with 11 percent.

The survey queried 807 Democrats and Democratic-leaning voters from Aug. 1 to 5 and has a 4.1 percentage-point margin of error.