You could just tax political donations or political ads. I'd suggest 50% federal tax, 25% state tax, and 25% local tax.
If you are taxed as a (lower than 100%) percentage of your donation, there's still a calculus that could make any amount worthwhile if leading to a lower percentage tax/higher percentage gain on your entire principal.
alt Hacker News
If you are taxed as a (lower than 100%) percentage of your donation, there's still a calculus that could make any amount worthwhile if leading to a lower percentage tax/higher percentage gain on your entire principal.