Sen. Raphael Warnock is in trouble this fall, according to an expansive poll conducted for the super PAC supporting the Georgia Democrat’s likely Republican rival, former professional athlete Herschel Walker.

In a survey of 2,500 registered voters, Walker led Warnock 51.4% to 41%, with 7.6% undecided. The senator’s problem appears to be President Joe Biden, whose job approval rating in this poll was 43.8% overall and 41.9% among independent voters. Voter dissatisfaction with Biden in turn generated a generic Senate ballot that preferred an unnamed Republican over an unnamed Democrat by a margin of 51.9% to 40%.