US President Barack Obama leaped back into the presidential campaign on Tuesday, aggressively challenging rival Mitt Romney in a tense second debate likely to reset the election contest.
Obama was all the things he was not in his first face-off with Romney - energetic, engaged, quick to defend his record and even quicker to tear into Romney. At points, he even jumped off his seat to challenge Romney.
Eager to score points from the opening minutes to the last, he cast Romney as an elitist who would help the rich, a chameleon who is all but lying to conceal his real agenda, a man whose scorn for the poor and working classes was revealed only in the secretly taped remarks in which he derided 47 per cent of the US as freeloaders.
Romney gave as good as he got through most of the debate, reminding voters at every opportunity of the weak economy under four years of Obama's leadership. He stumbled, however, at a turn over the attacks on US diplomats in Libya, an unforced error that allowed Obama to score at what otherwise might have been a moment of vulnerability.
The 90-minute debate in New York, likely helped Obama re-energise Democrats who were discouraged at his lacklustre performance in the first debate, and sends the two rivals into their final clash on Monday in Florida grappling for a breakout.
Most eyes were on Obama from the onset as he looked for ways stylistic and substantive to show voters he eagerly wants the job, and that Romney should not have it. In that first debate, he was passive at times, looking down at notes rather than making eye contact, and failing to raise such topics as Romney's remarks about the 47 per cent.
Obama worked throughout to tar Romney as a friend to the rich and powerful.
'His plan is to let the oil companies write the energy policies,' he said of Romney's push for more energy production.
He lambasted Romney's plan to cut taxes, saying they would necessarily force tax increases on the middle class.
'You're going to be paying for it,' Obama said. 'You can't buy the sales pitch.'
Obama all but called Romney a liar.
'What Governor Romney said just isn't true,' he said of Romney's comments on the auto industry.
'Very little of what Governor Romney just said is true,' he said of Romney's comments on energy.
Obama at times sat at the edge of his stool, rising quickly to physically challenge Romney face-to-face rather than waiting for Romney to finish and be seated.
Challenged by Romney the first time, Obama then walked away and faced the audience to answer a question. The second time Obama stood to confront him, Romney waved him back: 'You'll get your chance in a moment.'
When he wasn't jumping out of his seat, Obama watched Romney intently.
He wasn't Joe Biden, laughing or making hand gestures when the other guy was talking, as the vice president did in his debate last week with Republican Paul Ryan.
But Obama kept his eyes on his adversary, a noteworthy change from the first debate when he was often caught on camera looking down at his notes or away, giving voters the impression he was disinterested.
Romney refused to cede the stage, however, standing forward rather than returning to his seat while Obama spoke to the live audience in the town hall-style meeting.
Romney stayed on message most of the night, hammering away at economic anxiety about lost jobs, rising poverty and shrinking paycheques.
'The president's policies ... haven't put people to work,' he said.
'Middle-income families have been crushed,' he added.
Romney made a misstep, however, on the Obama administration's response to the attack on the US consulate in Libya.
Obama stated that he called the attack a terrorist act the next day, brushing aside suggestions that his administration spent weeks giving misleading accounts that instead blamed the attacks on a riotous response to anti-Muslim video.
Romney challenged Obama's assertion.
'Check the transcript,' Obama interrupted, and moderator Candy Crowley noted that Obama did use the word in his day-after comment. 'Say that a little louder, Candy,' a confident Obama said.
She went on to note that it did take two weeks for the whole story to emerge that there was never an anti-US protest outside the consulate as the administration had said.
But by then Obama had appeared to score, rather than being forced to defend the weeks of statements by him and others in his administration that pointed not at a deliberate terrorist attack but instead at an inflamed, spontaneous anti-US riot.