Support McCain?

When I went out to get my mail today, I found a letter with John McCain's name on the return address.Inside was a plea for $35 to help the McCain campaign to defeat Obama and his "massive and limitless fundraising machine." I thought McCain took public funds for his campaign! Why do I need to send him a single dime? He said the public funds were all he needed. And Why is Obama's massive fundraising machine so successful? I wonder...