The main battlegrounds: Ohio, Iowa, Colorado, Virginia, New Hampshire, Florida and Wisconsin. The late inclusion of Wisconsin on this list reflects a bet by Romney — buoyed by some polls showing an opportunity for him there — that he can turn a state that has not voted for a Republican presidential nominee since 1984.

Romney officials, eyeing steady gains in the polls, have not ruled out attempting to broaden the map in other states — claims met with disparagement by Obama aides, who say they remain confident their electoral college firewall is intact even amid a tightening national race and signs that three swing states in the South are looking more favorable for the GOP nominee.

Republicans are genuinely intrigued by the prospect of a strike in Pennsylvania and, POLITICO has learned, are considering going up on TV there outside the expensive Philadelphia market. But what Romney officials worry about, both in Pennsylvania and Michigan, is that if they put some cash down or use precious hours to send their candidate there Obama will respond by crushing their offensive with a big ad buy of his own…

“We’ll be back in Wisconsin,” said Eric Fehrnstrom. “Wisconsin is definitely in play.”