@pastanaga - I don't see why it's a bad thing for a politician to be tight with money. If anything, they seem to be far too loose with it these days. We're always hearing scandals where they spend public money on their own wants.
And besides, if someone sent them a check, even for a small amount, it wouldn't be polite not to cash it. It might be an old grandmother who still thinks 25 cents is worth giving someone, and if enough of them thought that, he could make a good amount!
I think it would be more interesting to send checks on behalf of strange or hated organisations and see if they would be willing to cash those kinds of campaign donations.