The long battle over the 2010 health care law was dominated by conservative forces attempting to tear down the legislation, according to an campaign ad spending analyst. From Mike Allen:

$235 million in negative ads about the healthcare law aired from its enactment on March 23, 2010 through June 17, 2012, compared to just $69 million in positive ads about the law, for a ratio of more than three to one.

--Top 10 anti-Obama-plan spenders: U.S. Chamber of Commerce, $27.0M; Crossroads GPS, $18.3M; 60 Plus Association, $9.6M; American Action Network, $9.0M; NRCC, $8.6M; American Crossroads, $6.0M; Americans for Prosperity,$5.9M; Pat Toomey, $5.6M; NRSC, $5.0M; Citizens Against Government Waste, $4.9M

--Top 10 pro-Obama-plan spenders: Dept. of Health and Human Services, $47.4M; California Endowment, $8.2M; Americans for Stable Quality Care, $2.1M; Joe Sestak, $1.3M; American Health Association, $1.1M; Health Information Campaign, $902K; Obama campaign, $708K; Russ Feingold, $658K; Blanche Lincoln, $603K; DNC, $546K