But Obama criticized Romney's prescriptions and his refusal to raise taxes and said, "if you take such an unbalanced approach then that means you are going to be gutting our investment in schools and education ... health care for seniors in nursing homes (and) for kids with disabilities."

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Not surprisingly, the two men disagreed over Medicare, a flash point since Romney placed Wisconsin Rep. Paul Ryan on his ticket.

The president repeatedly described Romney's plan as a "voucher program" that would raise out-of-pocket costs on seniors.

He continued, directly addressing the voters at home: "If you're 54 or 55 you might want to listen because this will affect you."

Romney said he doesn't support any changes for current retirees or those close to retirement.

"If you're 60 or 60 and older you don't need to listen further," he said, but he contended that fundamental changes are needed to prevent the system from becoming insolvent as millions of baby boom generation Americans become eligible.

Romney also made a detailed case for repealing Obamacare, the name attached to the health care plan that Obama pushed through Congress in 2010. "It has killed jobs," he said, and argued that the best approach is to "do what we did in my state."

Though he didn't say so, when he was governor Massachusetts passed legislation that required residents to purchase coverage - the so-called individual mandate that conservatives and he oppose on a national level.

Romney also said that Obamacare would cut $716 billion from Medicare over the next decade.

The president said the changes were part of a plan to lengthen the program's life, and he added that AARP, the seniors lobby, supports it.

With a two-minute closing statement, Obama said he had spent his first four years in office fighting for those in the emiddle class and those seeking to make it there. "If you'll vote for me, I'll fight just as hard in my second term," he said.

Romney was as critical of Obama's tenure as he was the moment the two men walked onto the stage.

If the president is re-elected, he predicted continued economic trouble for the middle class, chronic unemployment, higher costs for health insurance and "dramatic cuts to the military."

Obama took office in the shadow of an economic crisis but promised a turnaround that hasn't materialized. Economic growth has been sluggish throughout his term, with unemployment above 8 percent since before he took office.

The customary security blended with a festival-like atmosphere in the surrounding area on a warm and sunny day. The Lumineers performed for free, and Black Eyed Peas frontman will.i.am delivered a pep talk of sorts to Obama's supporters. School officials arranged to show the debate on monitors outside the hall for those without tickets.

There was local political theater, too, including female Romney supporters wearing short shorts and holding signs that said, "What War On Women?" - a rebuttal to claims by Obama and the Democrats.

The two presidential rivals also are scheduled to debate on Oct. 16 in Hempstead, N.Y., and Oct. 22 in Boca Raton, Fla.

Vice President Joe Biden and Republican Rep. Paul Ryan of Wisconsin have one debate, Oct. 11 in Danville, Ky. Both men have already begun holding practice sessions.