Exactly what was the legislation that Mccain co-sponsored that addressed Freddie & Fannie's risky loans?

I've Heard him say that he co-sponsored a bill that faced strong opposition by the democrats and never got a chance for a vote but what exactly was this bill? Is there a way to look it up? The first answer with a good link is what I'm looking for. And who were the people that actually held the bill up from going to a vote?