HARRISBURG -- Joe Grace, a lawyer and a former journalist, knows what it's like to be on the hot seat. He's been communications director for Philadelphia Mayor John Street for the past 2 1/2 years. But with Philadelphia getting a new mayor, Michael Nutter, in January, Mr. Grace is changing jobs, and effective Jan. 14 he'll have another challenge as the new executive director of CeaseFire PA, a nonprofit group that says it is "dedicated to preventing gun violence.'' CeaseFire PA has joined with Gov. Ed Rendell, another former Philadelphia mayor, in pushing for three new gun control laws from...