Anthony Weiner is on a roll.

A week after floating his name as a possible mayoral candidate, the disgraced former congressman finishes second when he’s included in the field of Democrats, a new poll reveals.

Weiner — who resigned from office in 2011 after getting caught in a sexting scandal — said he’s mulling a political comeback by running for mayor.

The Marist poll is the first to include Weiner, and shows him pulling 15 percent of the Democratic vote in a hypothetical race — trailing only Council Speaker Christine Quinn, who garners 26 percent.

Weiner outpolls two current citywide officeholders — Comptroller John Liu and Public Advocate Bill de Blasio — and former city Comptroller Bill Thompson, the 2009 Democratic nominee for mayor.

Liu receives 12 percent of the vote, and de Blasio and Thompson get 11 percent apiece.

A sizable 22 percent of the Democratic electorate is still undecided and 3 percent support goes to former City Councilman Sal Albanese or other candidates.

And, in a head-to-head general election match-up against Republican front-runner Joe Lhota, Weiner is ahead, 51 percent to 28 percent.

Weiner, who has conducted his own polling, declined to respond to the Marist survey yesterday.

“With Boston going on, it doesn’t feel right to talk politics,” he said.

The double-digit support would have a major impact on the primary, said Marist pollster Lee Miringoff, noting, “He makes it even more difficult for any of the Democratic contenders to reach the needed 40 percent to avoid a runoff.”

The other salient finding is that front-runner Quinn’s support has dropped considerably amid a torrent of criticism from her rivals. Without Weiner in the mix, Quinn gets 30 percent support, down from 37 percent in February.

When Weiner is thrown in the mix, he cuts equally into the support of all the major candidates.

But the Marist poll shows that Weiner is a polarizing figure with high negatives.

Only 40 percent of registered Dems want Weiner to run for mayor, while 46 percent do not. Another 14 percent aren’t sure. But Weiner’s numbers have dramatically improved since last October, when only 28 percent of Democrats wanted him to run, and a resounding 57 percent did not, with 14 percent unsure.

And Weiner now has a net positive rating among Democrats — 45 percent have a favorable view and 41 percent do not.

Two months ago, only 34 percent of Dems viewed him favorably and 43 percent did not.

A source close to de Blasio saw Quinn’s drop in support as good news, claiming she would be vulnerable in a one-on-one runoff.

There’s still time to sway voters. Only four-in-ten voters are paying close attention to the mayoral race now.

And the insider dismissed Weiner as too toxic to win the nomination.

“Weiner’s support is well below his pre-scandal levels, and nearly half of Democrats do not even want Weiner to run. With near 100% name recognition, he has little room to grow, unlike de Blasio,” the source said.