The ultimate question is whether Republican voters who embraced Donald J. Trump’s brand of us-versus-them divisiveness are ready for the themes that Mr. Scott is selling. “If you want to understand America, you need to start in Charleston; you need to understand and appreciate the devastation brought upon African Americans,” Mr. Scott counseled. Aides to Mr. Scott adamantly denied that he was running for vice president. Sellers said he would donate a kidney to the senator, though Mr. Scott would never get his vote. Last year, President Biden signed legislation championed for nearly a decade by Mr. Scott that made lynching a federal hate crime.