Discretion is the better part of Valor or so it goes.
Being a political activist and going door to door has to be one of the more dangerous choices for volunteer work, IMO. If it were me, there wouldn't be a moment without my sidearm. If you can conceal and that is your choosing then so be it. The "in you face" rout can be counter productive in the political arena and, contrary to popular belief some of the public, regardless of political persuasion are not comfortable around firearms.
A cell phone would also be on my 'must have' list. Thrusting yourself into the publics face and presenting yourself as an ally of the possible opposition will introduce you to some wild characters. You have to expect to encounter some virolent supporters of the candidate you are not supporting. As such, expect doors slammed in your face and the name calling (heck we get a lot of that right here and we're supposed to have guns in common) but as soon as that loon stared to following you around and screaming at you, it's time to make a call to 911.
Exposing your weapon can be misconstrued and in some states (don't know about your state. It's not listed) exposing your weapon is considered "threatening / brandishing" among other descriptions and is considered an illegal act. Check here:
Index of /states for your state.
Good luck and stay safe out there.