Penn Progress responded by pointing to other news articles that have also called Fetterman a "self-described democratic socialist," but no one seems to have found a quote from Fetterman actually referring to himself this way. That's because, according to his campaign, no such quote exists. In their letter, Fetterman's lawyers say the candidate "has never described himself as a 'democratic socialist'" and link to a 2016 interview in which Fetterman says, "No, I don't label myself a democratic socialist."
Fetterman's team is seeking to have this advertisement bumped from the airwaves because TV and radio stations can be held liable for defamatory content in third-party ads. (Because they're obligated under federal law to run candidate ads so long as they're paid for, broadcasters aren't liable for the content of such spots.) On Tuesday evening, the Fetterman campaign said that one station, WPVI in Philadelphia, had complied with its request.
Aside from the factual blunder, Lamb's supporters may be making a political mistake as well: Attacking a rival as too liberal in a Democratic primary is rarely a winning move. If Penn Progress' ad gets dinged, it may actually be a blessing in disguise for the super PAC.
This story has been updated to include the Fetterman campaign’s statement that one TV station has complied with its takedown request.