I thought she rushed through the speech a bit and talked on top of the crowd instead of letting them have some fun (a few times) but it was still good.
70,000 is the population of the town (actually, towns), but the crowd that came to see her was estimated by the fire chief at 70,000, which would be 20,000 inside the ticketed area and 50,000 on the field with the jumbo monitors outside. Someone else estimated it to be about 100,000, incidentally.