From one of my favorite analysts.

Presidential Election Campaign Fund checkoff box: If you check this box, $3 of your taxes will be earmarked for a special fund to pay for presidential campaigns. Notice that the government does not permit you to earmark the money for poor people, or sick people, or national defense. No, the government permits you to earmark money only for the purpose of enabling politicians to produce TV commercials designed to appeal to voters who have the IQ of a Vienna sausage.