Ezra Klein answers Brad Plumer's question

First Brad Plumer asks: "Why won't Obama just declare the debt ceiling unconstitutional?" Ezra Klein follows with "Whom will the public blame for debtageddon?" concluding that while the debacle isn't helping Obama, it is killing the Republicans. So Obama's just following the old piece of political advice, when you're opponent is being an ass, don't interrupt him. (Or something like that.)