I think the people who voted for Trump were far more likely to actually like him.The guy who had 96 mile long support parades and rented out airport hangers is losing to a guy who had 3 ppl sitting on towels in a grassy welcome parade?
People who voted for Biden were probably more unified by their anti-Trump sentiment.
That's why I don't think comparing Trump rallies with Biden rallies is very informative with regard to the vote. I think a better comparison would be to look at the 15-20 million people who participated in BLM rallies (protests).


