Andrew Cuomo was in the Clinton administration. He was the head of HUD or some kind of urban government agency. He didn't actually do anything, which in a way is a plus. He was simply there as a favor to the Mario Cuomo, Mario didn't repay the favor back.
There relationship has grown quite strained, from back when Bill Clinton at one point wanted to nominate Cuomo to SCOTUS, to now tell andrew cuomo to drop out of the governors race.
I don't know when things went sour, I do know that Andrew Cuomo was interested in running for the senate seat that Hillary took. I also know that the Clintons were angry when the liberal party of New York chose Andrew over McCall, and was also going to support Guiliani when he wanted to run for senator. There was alot more to them backing McCall then meets the eye, considering that McCall wasn't lying and neither was Sharpton when they said that Terry McCheat basically cut off dem funding of McCall, and decided, very early on, that he was dead in his campaign.