I remember this (paraphrased) back-and-forth from one of the Romney/Kennedy debates back when Mitt was running for the Senate seat from Massachusetts:
Romney (to Kennedy): Did you not use your influence in the Senate to buy a surplus government property in DC and then turn around and sell it shortly thereafter for a few million dollars profit?
Kennedy: I would not sully the Kennedy name of my martyred brothers, Jack and Robert, by engaging in such a self-serving transaction.
(This shut Mitt up on this subject.)
I wish ... oh how I wish Mitt had rejoined with "Does this mean that you are going to give the money back?"