Obamacare opponents have already run more than 30,000 television ads attacking the health law and Democratic candidates who support it, according to the media tracking group CMAG — a staggering 12-fold increase from four years ago. Many of the ads are being run in states with high uninsurance rates where hundreds of thousands of poor people could benefit from the Affordable Care Act, including Arkansas, Kentucky, and Louisiana.

Nearly half of all ads that have been run about the health law in House and Senate races through March 9 are critical of the ACA. And in a reflection of the post-Citizens United political landscape, spending by outside groups without any official connection to a particular organization or party accounts for almost three-fourths of all the commercials, compared to just 13 percent in 2010.

“We knew there would be heightened public awareness around the implementation of the law, and we thought it was important to go up early with a heavy effort,” said Tim Phillips, president of the Koch brother-funded group Americans for Prosperity (AFP), in an interview with Bloomberg.

AFP has run the most anti-Obamacare ads of any political group by a large margin, targeting vulnerable Democrats who are up for re-election, such as Sen. Mark Pryor (D-AR) and Sen. Mary Landrieu (D-LA). The organization’s spots play up misleading “horror stories” related to the health law, such as Americans who have had their insurance policies cancelled or seen their premiums spike. But the ads’ content tends to range from exaggeration to outright misinformation — and AFP has even been caught hiring paid actors to play the roles of “real” local residents.

More: Outside Political Groups Are Spending Record Amounts of Money to Deny Poor People Health Care