By CNN's Jack Cafferty: If President Obama had been a Broadway show last night, it would have closed after one performance. Even the president's staunchest supporters were baffled by his lackluster effort. MSNBC's Chris Matthews asked, "What was he doing?" Democratic strategist James Carville said, "Romney came in with a chainsaw." Commentator Andrew Sullivan said, … Continue reading Why did President Obama do so poorly at last night's debate?