It was this 2010 billboard ad by the Susan B. Anthony List against then-Congressman Steve Driehaus that started it (click to enlarge)…
Driehaus was a supposedly pro-life Democrat who voted for Obamacare.
Driehaus went on to lose his race to pro-life Republican Steve Chabot, only to turn around and file a complaint with the Ohio Election Commission, accusing SBA list of fraudulent advertising that resulted in his defeat. This despite the fact Obamacare indeed funds abortions.
Driehaus dropped that complaint only to file a federal complaint of defamation.