Crowd size, after all, is how Donald Trump supporters argue that the 2020 presidential election was stolen: There is no doubt Trump beat Joe Biden, they say, because Trump’s rallies were bigger, Trump’s boat parades were enormous, and, besides, everybody they knew voted for Trump. It’s good old-fashioned, indisputable math. And now, after Trump has spent the past two weeks insisting that the rally crowds drawn by Vice President Kamala Harris and running mate Tim Walz can’t compare with his, Trump has a new crazier attack: Those photos of overflowing arenas and airport hangars at Democratic ral…