He wrote, "Being that SMS votes cost 55c and NONE of the proceeds go to charity, I’m asking that you forget voting for me and consider donating 55c to cancer research instead?
"I’ve even created a special 55c button! Unforch it’s not deductible, because it’s less than two bucks. I cannot work harder for your donation and appreciate your consideration regardless."
It's not known how much is actually made from voting, but contestants do dance for the chance to win $50,000 for their chosen charity.
Sam is, of course, dancing for his Love Your Sister charity, which he's raised an incredible $7 million for.