It depends. In Minnesota, wearing any of the items you listed would be considered electioneering if that was a major issue of the campaign. So if one candidate

It depends. In Minnesota, wearing any of the items you listed would be considered electioneering if that was a major issue of the campaign. So if one candidate has made gay rights a major plank of their platform, then wearing a shirt with a gay pride flag would run afoul of the rules. But that same shirt would be allowed in the absence of that specific issue being promoted by a candidate’s campaign.