If you can be swayed to vote a certain way because somebody else is wearing red or blue, then you are incapable of independent thought and ought not be voting.
Go back to Starbucks and order whatever the person in front of you is having.
I think that tactict is used so exit polls can be more easily skewed. If 100 red shirted people leave a booth, a reasonable assumption is that a large percentage of them voted R. But if red shirts are banned, the lie is easier to make that no Rs showed up to vote.
Perfect keyboard wrecker.
Studies have shown that if there is an US flag on display in the polling place people are more likely to vote Republican.