Ezra Klein's article on the potential mother of meep-meeps is worth reading in full:
The Obama team never could have predicted that its efforts would help vault Ryan into the nomination for vice president. The difference between what they reasonably hoped a strategy like this could achieve and what it actually achieved is attributable to Ryan, who has proven a tremendously skilled politician — so skilled, in fact, that he’s convinced many Republicans that the fight Obama wants is the fight they should want, too. Many of them share House Whip Kevin McCarthy’s view. “It’s not so smart to raise [Ryan] up by picking him as an enemy,” he told Draper. “If he picks a budget fight with Paul, Paul will beat him.”
The White House, obviously, disagrees. The result, to paraphrase H.L. Mencken, is that the Obama administration knew the fight they wanted, and now they’re going to get it good and hard.