Today's been a Larry Summers-heavy day on the blog, but then, it's been a Larry Summers-heavy day in Washington, too. David Leonhardt reports from Summers' Q&A at Brookings, and a few points jumped out. One is that Summers says "his No. 1 aim had been to persuade people that the economy would not necessarily fix itself," which says something about the kinds of people Summers is spending his day talking to. Summers also argued that the administration was right to be vague on its banking plan. Specifics, he said, could only come after the stress tests reveal what action is needed. That sounds sensible enough, though it's hard to say whether that's been the plan along or it's just the plan now that no one liked Geithner's original banking proposal. And finally, Summers gave a nice little speech in favor of strengthening unions.