There has been a lot of reporting about the size of crowds at campaign rallies. I have never been too impressed by crowd sizes as an indicator of popularity because however large they may be, they represent just a tiny fraction of the votes one needs to win. They measure more the depth of intensity of the most ardent supporters of a candidate, not the breadth of support. For example, in the case of creepy Donald Trump, there seem to be many of the same people who go to rally after rally, sometimes traveling great distances. It is like a cult following. Such people can swell multiple rally crowd numbers but still have only one vote.
But rally crowds do help campaigns in several important ways. The people who are enthusiastic enough to spend a big chunk of a day going to a campaign event and lining up to get in are those who are very likely to vote and, more importantly, more willing to work on the campaign in some way. You can be sure that there are campaign staffers at these events who are signing up people as donors and volunteers. While getting money helps since so much is needed for expensive TV advertising, American elections are awash with so much dark money that by the time elections come around, the airwaves are saturated with so many ads that they are unlikely to sway voters. Their purpose is largely to remind those who are already committed as to why they should stick with the candidate. The main benefit of getting new people to contribute even a small amount is not the money but because once you have given money to some cause, you are more invested in that candidate and want that person to win, like betting on a horse or a sports team.
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