Romney has a lot of money to run ads, much more than Obama.
Karl Rove’s SuperPAC, by itself, has over a BILLION DOLLARS to spend, IIRC. But remember, Mr. Obama has 97% of the media in his pocket, the unions, the NGOs, reformulated ACORN, Nation of Islam, Black Panthers, tree-huggers, Lavender Mafia, etc...
I really doubt that Romney has more money to spend than Obama. The foreign dough alone, although illegal, will fund whatever the Obama campaign has up it’s sleeves.