Obama still on defense (Originally posted on Yahoo!'s "The Signal" Blog)

Woody Allen is often quoted as saying that "80 percent of success is showing up." Hackneyed though this expression has become, it applies quite accurately to the election as it stands today. President Barack Obama showed up at the debate on Tuesday night and stabled his teetering campaign.

Given the wide consensus that Obama did not mentally show up for the first confrontation with former Gov. Mitt Romney, his combativeness and general vigor appeared to convince the television audience that he still has some fight left in him. Instant polls suggest that Obama scored well overall and, more critically, with undecided and leaning voters. Polls of overall voters are not that meaningful, because most people will say their candidate won. But surveys of undecided and leaning voters, like those from CBS and Xbox/YouGov, give us valuable clues. Obama clearly outperformed Romney in both.

Our real-time forecast, heavily influenced by prediction markets at this point in the campaign, ticked up nearly 3 percentage points during last night's debate.

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