The sequester is all anybody wants to talk about. I get it: It’s the hip new crisis sweeping Washington. But remember Fannie Mae and Freddie Mac? You know, the once quasi-independent housing giants whose takeover by the federal government has cost taxpayers upwards of $190 billion thus far? Well, Fannie and Freddie are still owned by the federal government and, on top of that, are the only thing holding the U.S.’ badly battered housing-finance system together, as the Feds back 9 out of 10 mortgages issued today.