They are nuts. I've had some come to my door over the last few years. I'm polite and say I'm not interested and to have a nice day. They just get angry that I won't talk to them and get excited about their cause.

Hard core democratic partisans seem to be mostly mentally ill.
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The easiest way of getting rid of them is that you tell them that you'll consider voting for their candidate, this way you won't be lying. Let them know that you're really busy at the time to hear their spiel and that you'll think about it.