The race between Barack Obama and Mitt Romney continued to heat up this week, with a new poll showing that the Republican has caught up with the president in the swing states of Ohio and Florida. Obama pulled ahead in Pennsylvania, however, according to the Quinnipiac University poll. The three states are crucial to either candidate locking up the White House. “What appears to be keeping Romney in the ballgame, at least in Florida and Ohio, is the perception he can better fix the economy,” said Peter A. Brown, assistant director of Quinnipiac’s polling institute.