Yes, but that presumes that voters have enough income to benefit from the tax deduction, and/or are able to afford the donation, and are aware enough to realize that they get a tax credit for donating. None of these things will necessarily be the case. And it isn't unreasonable to assume that if you *did* donate, you'd give at least $2/year to the party you voted for. It's not as though the parties are getting $100 per year per vote.

(And here I am standing up for the proletariat, when I'm one of the more conservative people on mousme's Friends list!)