You already know this. Obama, Clinton, Giuliani, Edwards all have books making them piles of money. Some are already wealthy enough to easily cast a half million or more away to charity, a noble thing to do. Not one has yet to give the proverbial widow's mite, but every dollar helps.
Which brings me to a point. Why not consider (at least) for every dollar you give to support your candidate (including T-shirt purchases, books as well as donations), you support and equal amount toward the local homeless mission nearest your home? I'm doing that. And, at least 10% of whatever my blog makes will go to a nonprofit charity.
Top candidates profit from book deals (Yahoo.com story)
Search Books by Your Favorite Politician
Hillary Rodham Clinton