During a campaign stop in Wadley, Ga., Herschel Walker, the state’s Republican candidate for U.S. Senate, dismissed a report that he paid for an ex-girlfriend’s abortion. WADLEY, Ga. — Herschel Walker, the Republican candidate for U.S. Senate in Georgia, drove to a lumber yard on Thursday in this tiny town 150 miles east of Atlanta for his first public event since he was accused of paying for an ex-girlfriend’s abortion. But there was no getting away from the claim that threatens to upend his political aspirations. Asked if he had contacted any of the mothers of his children, one of...