What's the deal with Freddie and Fannie ties to Obama?

http://www.opensecrets.org/news/2008/09/update-fannie-mae-and-freddie.html

http://overthehilloracles.wordpress.com/2008/09/09/the-obama-fannie-freddie-connection/
“You look at Obama’s economic advisers, the guys he has counted on from day one and who have raised him a ton — and I mean a ton — of money: Franklin Raines and Jim Johnson, both of them are waist to neck deep in the mortgage debacle.”

Both Raines and Johnson have served as CEO of Fannie Mae, with Raines taking over from Johnson. Both are key political and economic advisers to Obama.