If you want a litmus test for how low MAGA is willing to sink, it’s right there in the Ohio Governor's race.

Earlier this week, Ohio gubernatorial candidate Vivek Ramaswamy released an attack ad featuring a woman named Donna Arthur , the estranged mother of his opponent, the physician and researcher Amy Acton . Almost instantly, the spot kicked off a firestorm of condemnation and debate that has fractured the Republican coalition on the eve of a hugely consequential midterm election.

In the ad, Arthur alleges that her daughter, Acton, is a “liar.” “It’s not easy for a mother to say this, but Amy has a serious problem,” Arthur says. The ad — a direct family member denouncing a candidate — is the kind of political hit that is often devastating to a campaign or a candidate’s character, which is clearly what Ramaswamy intended it to be. But the tragic and well-documented facts of Acton’s life quickly revealed Ramaswamy’s tactics as a new low for his campaign and party.…