[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/02/20/art.bloomberg.gi.jpg caption="New York City Mayor Michael Bloomberg holds a 10 point lead over his top Democratic challenger."](CNN) - The top Democratic challenger to New York City Mayor Michael Bloomberg now trails the mayor by 10 percentage points, according to a new Quinnipiac University poll released Tuesday.
That's a drop from the 22-point lead Bloomberg held over New York City Comptroller William Thompson in the previous Quinnipiac poll released June 16.
Fifty-nine percent of New York City voters give Bloomberg a favorable rating in Tuesday's poll while 34 percent rated the mayor unfavorably. Sixty-three percent approve of the job Bloomberg is doing, while 29 percent disapprove.
Tuesday's poll surveyed 1,290 New York City registered voters from July 21-27. The poll has a margin of error of plus or minus 2.7 percentage points. In the poll, Bloomberg was identified as "running as both a Republican and an independent" while in Quinnipiac's June 16 survey, Bloomberg was identified only as an independent.