Not only did they turn on the money spigot, Greenspan never increased margin requirements to buy stocks on margin during the bubble. If you recall, all the major brokerage houses did his job for him by restricting the margin puchase of a lot of the dot-com stocks. If I was Greenspan, I would have been embarassed about that lack of proper regulatory action.
Greenspan sold out early in Clinton's first term, when Greenspan's own term was up and Clinton had him over the barrel. As Clinton began to get in more trouble, he played some cards he had to play with Greenspan, kept the market flying artificially, and a bunch of sell-outs allowed a temporary financial windfall to cloud their judgement, looking the other way and giving Clinton a pass. These same people will take a big hit in the coming years, for the damage Clinton caused, to our financial system, and our country in general.