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There's actually a far more important mechanism falling short of public expectation or even legitimate function right now - namely the current Republican Party. Thankfully, we already know why that machinery of government isn't working: The Tea Party wing of the GOP, that's dragging the party down rapidly.
As John Judis of The New Republic wrote on Monday, and as all but the most delusional right-wing fanatics have already admitted, the Tea Party is going down. Whether they last until the 2016 election is anyone's guess, but as Judis notes, after the teapeople brought the government to a dead stop and nearly blew up the world's economy earlier this month GOP leaders aren't likely to let them do the same thing again this winter.