Mark Murray of NBC has the ad spending numbers from the Romney campaign and his SuperPAC supporters:
Why Obama camp up in PA, MN, MI? Team Romney outspending Team Obama, 4.6M to 1.8M in PA this week, 3.1M to 725K in MN, 2M to 445K in MI
— Mark Murray (@mmurraypolitics) October 31, 2012
Plenty of this money is the SuperPAC moreso than the actual Romney campaign, but the point stands that in these outer Battlegrounds Team Romney is committing serious dollars at a 3:1 pace over Obama.