I have been working the polls for years and I once had to intervene for a voter who was wearing an Obama cap. One of the workers asked that voter to take it off while voting. I intervened for the voter since Obama was not on the ticket and it was allowed. Sometimes you have to go to the next person up in the food chain. Disclaimer: I was anything but an Obama supporter, but, election rules are the rules. If the museum security person was rude and insulting, now we have an issue.