What is the point/objective of political rallies in the 21st Century?

[Whack-a-Mole]

FWIW this thread was started a few days ago and it may answer some of your questions:

Is there any value to political rallies?

With the election moving into its final days I have seen some videos of the candidates at political rallies and it made me wonder…why? It seems like the epitome of preaching to the choir. They pack a stadium or whatever with their own people who hoot and holler at every sentence the candidate says (or VP too in this case). Why spend the money and time to harangue people who are already totally on your side? Often with a stump speech that has been repeated 100 times? This goes for any party.…