Philadelphia police officers examine handguns after a news conference held by Rep. Chaka Fattah, D-Pa., regarding the "Groceries for Guns Exchange" program Thursday, May 3, 2007, in Philadelphia. Barack Obama and Hillary Rodham Clinton are gingerly threading their way between two of the most politically charged numbers in Pennsylvania: the state's almost 1 million licensed hunters and Philadelphia's nearly one-a-day rate of gun murders. Gun control arouses deep emotions in the state. (AP Photo/George Widman)

Rep. Chaka Fattah, D-Pa. is seen in the East Falls section of Philadelphia in this May 15, 2007 file photo. Pennsylvania's political power players, who watched in many past presidential elections as early voting states like Iowa and New Hampshire typically got much of the attention from candidates and the media, are suddenly in the spotlight - at least on the Democratic side. (AP Photo/Matt Rourke, File)