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While both candidates did well tonight, and each did what they needed to do. I think Clinton had in mind taking the edge off her personality and blunting the blowback her on-the-trail approach has caused.
But I think the big winner in the debate from a strategy standpoint is Obama. I say this as a supporter, but I think he did the most important piece of business he could have: address the substance issue.
Although Obama has detailed policy papers, and his interview with the SF Chronicle is extremely meaty, he has suffered from the (I believe mistaken) impression that he is style without substance: hope and fluff but without the policy chops. Perhaps because the policy forums, papers and the like are outlets that only the most dedicated internet archeologists often dig up.
So here, he forgoes too much flower while remaining clear and forceful... but goes into wonk mode. He matches her point for point, goes into detail on every question and provides hard details. Some of his proposals perhaps you liked better, some perhaps not. But by going toe-to-toe with Clinton on her turf and biggest strength, he neutralizes one of her biggest sell points.
Also, I think the "you want someone who is RIGHT day one" really punched home the judgement thing in a very simple, straight-up formula.