May I wear a button or teeshirt or anything else with the name of a candidate into the polling place?
The details may vary from state to state, but, in general, no one is allowed to campaign for a candidate or ballot measure within 100 feet of the entrance to a polling location. This means you should not wear a teeshirt or a campaign button or carry flyers, for example, about any candidate, political party, or ballot measure. Consult your state’s elections laws for details.