 He spoke without notes there and later at a rally at a union hall in Harrisburg. That event was outside in a courtyard. It was over 90 degrees outside, and he shook hands for a good 45 minutes after delivering brief remarks. At one point during that very long, hot marathon of chatting with supporters, Gloria Gaynor's I Will Survive came on the sound system. And the whole point seemed to be to show his critics that he has the stamina to beat Trump.