President Donald Trump may well have won his reelection effort in one fateful moment in Butler, Pennsylvania. It will doubtless prove to be one of those "remember where you were when..." moments, and his reaction to being grazed by an assassin's bullet, leaping back to his feet, shaking his fist and shouting "Fight! Fight! Fight!" was (as I've written repeatedly) probably the most powerful image in American politics since Ronald Reagan's Brandenburg Gate speech. As for the attempted assassin himself, he was quickly dispatched by law enforcement - and a lot of questions remain around him. Who was Thomas Crook?...