 The same survey shows, however, that the head-to-head horse race is effectively tied two weeks after the debate, which would indicate that the debate has not really had much of an impact on the overall dynamic of the race. And yet, it has changed Americans' views of the president himself and his ability to serve four more years. 85% in our survey now say that Joe Biden is too old for a second term. And while most say the same about Trump, Biden leads on that score by 25 points.