As long as it is evenly enforced, I fail to see the problem. I’ve seen people wearing blatant Dem propaganda being turned away at my local polls, too.
"Clarifies that the exemption allowing a voter to enter a polling place wearing a shirt, hat, or other apparel on which a candidate's name or a political slogan appears does not apply to candidates, representatives of candidates, or any other person who enters the polling place for a purpose other than voting.