rivals’ debate last week, when Obama needed a comeback after a listless performance in their first meeting on Oct. 3.

But there was no mistaking the urgency. The two men frequently sniped at one another even on issues where they agree, and reprised their campaign-long disagreements over the economy, energy, education and other domestic issues despite ground rules that stipulated the debate cover international affairs.

Obama and Romney are locked in a close race in national opinion polls. The final debate behind them, both men intend to embark on a final two-week whirlwind of campaigning. The president is slated to speak in six states during a two-day trip that begins Wednesday and includes a night aboard Air force One as it flies from Las Vegas to Tampa. Romney intends tovisit two or three states a day.

Already four million ballots have been cast in early voting in more than two dozen states.

On the Middle East, Romney said that despite early hopes, the ouster of despotic regimes in Egypt, Libya and elsewhere over the past year has resulted in a “rising tide of chaos.” He said the president has failed to come up with a coherent policy to grapple with change sweeping the Middle East, and he added ominously that an al-Qaida-like group has taken over northern Mali.

President Barack Obama during the Presidential Debate at Lynn University in Florida. (Marc Serota/Getty Images)

Anticipating one of Obama’s most frequent campaign assertions, Romney said of the man seated nearby, “I congratulate him on taking out Osama bin Laden and taking on the