Total ad spending by the campaigns: $549 million
Obama campaign: $336 million
Romney campaign: $213 million

Total outside ad spending: $435 million (44% of total)
Outside spending supporting Obama: $65 million
Outside spending supporting Romney: $370 million

Per state: Ohio $197 million, Florida $192 million, Virginia $152 million, Colorado $81 million, Iowa $74 million, North Carolina $70 million, Nevada $60 million, Wisconsin $45 million, New Hampshire $44 million, Pennsylvania $35 million, Michigan $19 million, Minnesota $11 million, New Mexico $3 million, Maine $400,000