Mayor Michael Bloomberg has a 60 percent approval among New York City voters and now tops all Democratic challengers by 15 percentage points or more, according to a Quinnipiac University poll released today. Even Democrats approve 58 - 32 percent of Mayor Bloomberg, while Republicans approve 72 - 23 percent and independent voters approve 60 - 28 percent. Black voters approve 59 - 27 percent, while white voters approve 66 - 27 percent and Hispanic voters approve 50 - 40 percent. The Mayor is now over the 50 percent mark when matched against any Democratic contender, the independent Quinnipiac (KWIN-uh-pe-ack)...