<p>Arizona Sen. John McCain warned Republican presidential candidates on Sunday the GOP will “pay a price" at the polls if they continue personal attacks on “character and integrity.” </p><p>“I think we are hurting ourselves and our chances in general election if we disparage each other and impugn character,” McCain said on CNN’s “State of the Union.” “I wish we would think about Ronald Reagan, and the way he conducted his campaigns.”</p><p>McCain said he believes candidates should condemn bigotry when they hear it on the campaign trail, which he experienced when he ran for president in 2008.