The presidential campaigns locked horns on Tuesday over the competitive status of key battleground states that will determine who has the more likely path to victory through the Electoral College.

The Romney campaign, which has been playing political offense in recent days, claims to have momentum in states where President Obama was previously considered to have a lock on victory.

On Tuesday, the Romney campaign circulated a memo from political director Rich Beeson saying that both Minnesota and Pennsylvania were trending toward the GOP challenger.

“Not only has Minnesota been moved to ‘Lean Dem’ and the Obama Campaign is up in that state with a significant television buy, but the Chicago gurus have heeded Governor [Ed] Rendell’s plea and are buying television in Pennsylvania and sending the Vice-President in to help prop up their flagging campaign,” the memo read in part.