Obama money and rank rumor

Along with many others, I am amazed by the millions of dollars that this brand new senator virtually unknown except for one speech (there it is again, one speech) raised almost immediately for his campaign to be president.  At first, I thought maybe it is Republicans who want to stop Hillary before she even gets one step closer to the presidency and then I even began to accept the spin about all those little supporters from the internet.  But then, a friend of mine called with this tidbit. (Warning! Rank Rumor! No Proof Yet!) She said she knew of  two of her friends, both African American who got letters thanking them for their $50.00 contribution to the  Obama campaign EXCEPT they NEVER made any kind of contribution and were more than a little surprised.  Mmmmmmmm!!!  Of course, they did not want to make this public because they are AA and in their community, it is not a good idea to do anything to diminish Obama. Shades of O.J. Simpson and so much for the "politics of fear" purity.  Anyone else hear anything interesting on the money issue?