Message to all the politicians who have somehow acquired my email address:
I could be wrong, but I don't think the fact that you're a politician looking for campaign contributions exempts you from the laws on unsolicited email.
At the very least, you need to provide—in each and every message—a way for the recipient to opt out of future emails. Most respectable businesses seem to comply with this. I can't think of one politician's request for contributions I've received recently that does.
Really, I'm on your side and I wish you well. But right now I haven't got any spare money to send you. So please give me a way to unsubscribe. Thank you, and God bless.