Nutter is the overwhelming favorite over little-known Republican challenger Karen Brown, a former high school math teacher and Democrat who switched parties to challenge Nutter.
The 54-year-old incumbent had an up-and-down first term. Homicides are down 18 percent since his 2007 election, but that's far less than the goal Nutter set. He's implemented single-stream recycling and a 311 information call center, but other plans were scaled back due to the economic downturn.
The 52-year-old Brown's low-budget campaign has gained little traction.
Brown says Nutter hasn't fulfilled a vow to cut homicides 30 percent to 50 percent. She also says he hasn't done enough to improve the city's beleaguered schools and help small businesses.
