Poll: Quinn, De Blasio neck-and-neck in NYC mayoral race

(CNN) - Another poll indicates continued shuffling in the Democratic race for New York City's mayor.

Public Advocate Bill de Blasio and City Council Speaker Christine Quinn are tied at 24% among likely primary voters, while former Rep. Anthony Weiner remains at the back of the pack, according to the new NBC4/Wall Street Journal/Marist poll released Thursday.

The poll was conducted Monday through Wednesday, a time window that included the first major televised debate between the top five candidates Tuesday night.

Former comptroller Bill Thompson comes in not far behind the two leaders at 18%, just three percentage points behind Quinn and well within the survey's sampling error.

Weiner, who was once a frontrunner, has 11% support. His numbers have fallen drastically since admitting in July that he continued sending lewd messages to women online for more than a year after resigning from Congress.

Twelve percent of likely voters are undecided.

The poll comes two days after a Quinnipiac University survey showed de Blasio with more of an edge over Quinn, 30%-24%. Thompson came in at 22% and Weiner had 10%.

If a candidate fails to cross the 40% threshold on the September 10 primary, the race turns into a runoff between the top two contenders set for October 1.

According to the new poll, Quinn falls behind both de Blasio and Thompson in hypothetical runoff matchups.

In the Democratic comptroller race between former New York governor and attorney general Eliot Spitzer and Manhattan Borough President Scott Stringer, Spitzer holds a commanding lead over his rival, 54%-36% among likely primary voters.

The NBC4/Wall Street Journal/Marist poll was conducted among 355 likely primary voters between Monday and Wednesday, with a sampling error of plus or minus 5.2 percentage points.