U.S. PIRG regularly sends door-to-door solicitors to recruit activists and money in areas where they figure the pickings are good.
I've been solicited at my door (in different states) twice but had a hard time convincing them that I knew who they were and I was on the other side.
I resisted the temptation to clearly state the situation.
"Get off my porch, I hereby specifically cancel your implied license to enter my property. We're your worst nightmare; heavily-armed, libertarian, right-wing, Christian, homeschoolers who always vote Republican."
My daughter hates it when I tell the truth.