Political Cleanup program

Politics is traditionally corrupt, it appears, because donors to politicians and political campaigns expect a quid pro quo for their donations. Various unsatisfactory solutions include campaign spending limits, etc. It occurs to me that it would be a major advance if a system could be set up that would "blind" campaign donations as to their source: The donor could be satisfied that his donation gets to the candidate or cause, but the candidate couldn't know who actually paid the money (and the donor would be unable to prove that he made a donation, for example). Admittedly there are a lot of details that need to be worked out, but if this could be accomplished it would change politics as we know it.