But 15 to 1?

Yes. That’s the ratio calculated by campaign media analysis group — CMAG to political junkies. Kantar estimates that national advertising against the ACA cost $418 million, compared with $27 million for ads supporting the law. Kantar calls the anti-ACA spending “unprecedented [and] largely unanswered.”

Even in general election-focused ads this year, 76 percent of Republican ads airing from January through April attacked the health care law. In Senate campaigns in New Hampshire and North Carolina and in 13 House races, Kantar found that every GOP broadcast ad brought up the anti-ACA messages.

Kantar’s Elizabeth Wilner, a co-author of the analysis, said, “Positive ads about the ACA are still so rare that whenever one appears, it gets a national news story.”