This isn't exactly what I meant, but it's not infeasible either. I have a friend whos working on a charity to help people give conditional donations to politic

This isn't exactly what I meant, but it's not infeasible either. I have a friend whos working on a charity to help people give conditional donations to political campaigns, like only giving money to a politician on the condition they vote yes on bill x, or having your donation divided equally among people who voted against marijuana prohibitions. In which case, it might be more effective to do something like this than to donate to a defense fund for people accused of weed related crimes.