A question came up in the comments section as to how you should donate money. Rather than collecting the money myself, I'm asking that those who choose to participate donate money to the charity online. That is, just visit the websites of Doctors Without Borders, Human Rights Watch, or Amnesty International, and follow their instructions to donate online.
Then, once you receive an email confirmation of your donation, simply forward that information, along with your vote allocation to firstname.lastname@example.org.
This way, you can be certain your money has made it to the charity you choose and it's easier for me since I only have to tally votes and not worry about collecting any money.