Largest numbers of the sweng states but because polling now looks competitive. >> key stone state has not been kind. the president by more than 10 percentage points and g.o.p. carried pennsylvania 24 years ago when george hw bush beat dukakis. the id law requires voters to show photo id at the polls. and letting those coming to cast ballots know about the change. >> democrats nationwide argued this disenfranchised foreign minority voters. and it's unclear what impact the new law will have here in pennsylvania. registered democrats 50-37% in philadelphia fox news. >> mitt romney won