City Council Speaker Christine Quinn continues to lead the pack of 2013 Democratic mayoral contenders, according to a new NY1-Marist poll released today. Were the Democratic primary held today, 20 percent of those polled said they would support the council speaker. Following four points behind her was Brooklyn Borough President Marty Markowitz, who has said he has no interest in running for mayor.

While she might have the most dedicated support, one-in-four of those polled said they were still undecided.

“With 25 percent of Democrats undecided and the field lacking a dominant top tier of candidates, this is a campaign story still to be told,” said Marist College's Institute of Public Opinion President Lee Miringoff in a statement.

But there's trouble on the horizon for Quinn, whose support from Mayor Michael Bloomberg in the race is an open secret. Bloomberg's support would make 48 percent of those polled less likely to vote for the candidate the mayor backs.

“Those looking to succeed Mayor Bloomberg might welcome his support. But, if the numbers hold, don't expect anyone to make his endorsement the centerpiece of their campaign,” Miringoff said.

The rest of the field break down:

• Former New York City Comptroller Bill Thompson: 12 percent
• Comptroller John Liu: 10 percent
• Public Advocate Bill de Blasio: 7 percent
• Manhattan Borough President Scott Stringer: 6 percent
• Manhattan Media Publisher Tom Allon: 2 percent

Update: Crosstabs below.
EMBARGOED_Complete September 26, 2011 NYC NY1-Marist Poll Release and Tables