@Scubbie - I mean, why?
It's an unnecessary risk. At my polling place, no one would know if the gun didn't show through clothing. But if your polling place has metal detectors...
If it were a concern of mine, I would do an absentee/mail-in ballot.
I dunno. It's not something I would do. The fact that it's a polling place, would probably make it a federal headache. And who needs that?