DENVER (AP) -- The issues that have dominated television advertising in up-for-grab swing states were all but absent from President Barack Obama's first debate with Republican challenger Mitt Romney.
Instead, Obama and Romney sparred on spending, taxes and the role of government.
No one mentioned the "you didn't build that" comment that quickly became a favorite Republican attack after Obama said it to an audience in Virginia. Nor did anyone invoke the "47 percent" of Americans who Romney said in a hidden-camera video don't pay taxes and see themselves as victims.
Neither candidate discussed Obama's endorsement of gay marriage or his decision to halt deportations for some young illegal immigrants. And no one brought up Romney's strong criticism of unions, either.
In a showdown at close quarters, an aggressive Romney sparred with Obama taxes, deficits and strong steps needed to create jobs in a sputtering national economy. "The status quo is not going to cut it," declared the Republican challenger.
Democrat Obama in turn accused his rival of seeking to "double down" on economic policies that actually led to the devastating national downturn four years ago - and of evasiveness when it came to prescriptions for tax changes, health care, Wall Street regulation and more.
With early voting already under way in dozens of states, Romney was particularly assertive in the 90-minute event that drew a television audience likely to be counted in the tens of millions - like a man intent on shaking up the campaign with a little less than five weeks to run.
He seemed at ease in debate with the man who has been in the White House for four years. "It's fun, isn't it?" Romney said.
The former Massachusetts governor virtually lectured Obama at one point after the president accused him of seeking to cut education funds. "Mr. President, you're entitled to your own airplane and your own house, but not your own facts," he said.
The economy dominated the evening, as it has the race for the White House all year. Pre-debate opinion polls showed Obama with a slight advantage in key battleground states and nationally.
Romney said he had plans to fix the economy, overhaul the tax code, repeal Obama's health care plan and replace with a better alternative, remake Medicare, pass a substitute for the legislation designed to prevent another financial crash and reduce deficits - but he provided no new specifics despite Obama's prodding.
Said Obama: "At some point the American people have to ask themselves: Is the reason Governor Romney is keeping all these plans secret, is it because they're going to be too good? Because middle class families benefit too much? No."
The two men debate twice more this month, but they were first going their separate ways on Thursday. Obama had campaign stops in Colorado and then Madison, Wis., while Romney was booked into Virginia. All three states are among the nine battlegrounds likely to settle the race.
At times the debate turned into rapid-fire charges and retorts that drew on dense facts and figures that were difficult to follow. The men argued over oil industry subsidies, federal spending as a percentage of the GDP, Medicare cuts, taxes and small businesses and the size of the federal deficit and how it grew.
Obama sometimes seemed somewhat professorial. Romney was more assertive and didn't hesitate to interrupt the president or moderator Jim Lehrer, who seemed to struggle to maintain control.
The wonky tone of the debate was a stark contrast to the harsh, broad-brush and sometimes personal attacks the two men make in person and in multimillion-dollar television advertising.
At the same time, Romney managed to make some points by personalizing his comments with recollections of people he said he had met on the campaign trail. In another folksy reference, Romney told Lehrer, a veteran of the Public Broadcasting Service, that he would stop the federal subsidy to PBS even though "I love Big Bird."
Generally polite but pointed, the two men agreed about little if anything.
Obama said his opponent's plan to reduce all tax rates by 20 percent would cost $5 trillion and benefit the wealthy at the expense of middle income taxpayers.
Shot back Romney: "Virtually everything he just said about my tax plan is inaccurate."
The former Massachusetts governor and businessman added that Obama's proposal to allow the expiration of tax cuts on upper-level income would mean tax increases on small businesses that create jobs by the hundreds of thousands.
The two campaign rivals clasped hands and smiled as they strode onto the debate stage at the University of Denver, then waved to the audience before taking their places behind identical lecterns.
There was a quick moment of laughter, when Obama referred to first lady Michelle Obama as "sweetie" and noted it was their 20th anniversary.
Romney added best wishes, and said to the first couple, "I'm sure this is the most romantic place you could imagine, here with me."
Both candidates' wives were in the audience.
Without saying so, the two rivals quickly got to the crux of their race - Romney's eagerness to turn the contest into a referendum on the past four years while the incumbent desires for voters to choose between his plan for the next four years and the one his rival backs.
Romney ticked off the dreary economic facts of life - a sharp spike in food stamps, economic growth "lower this year than last" and "23 million people out of work or stropped looking for work."
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."
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 middle 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 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.
Some notable moments from the first presidential debate Wednesday night between Democratic President Barack Obama and Republican Mitt Romney, just 34 days before the Nov. 6 election.
FIGHTING OVER THE FACTS
The debate brought a constant tug-and-pull over the facts: Obama's version versus Romney's.
Romney accused Obama of mischaracterizing several parts of his agenda, from taxes to Wall Street reform. Romney told the president that as the father of five sons, "I'm used to people saying something that's not always true but just keep on repeating it and ultimately hoping I'll believe it."
At another point, Romney said, "Mr. President, you're entitled to your own house and your own airplane, but not your own facts."
Obama repeatedly accused Romney of pushing for changes to Medicare that would turn it into a voucher-like program.
To those in the audience, Obama said: "If you're 54 or 55, you might want to listen."
PBS newsman Jim Lehrer got mixed reviews for his role as the moderator.
The two candidates strayed from the time limits throughout the debate and Lehrer struggled to enforce the set 15-minute segments covering the economy, health care and other topics. The result was a steady back-and-forth between Obama and Romney, with the candidates often talking over themselves.
Many viewers took to Twitter, panning Lehrer's handling of the debate.
Romney even said he'd cut funding for Lehrer's network. "I'm sorry, Jim, I'm going to stop the subsidy to PBS ... I like PBS, I love Big Bird. Actually like you, too. But I'm not going to -- I'm not going to keep on spending money on things to borrow money from China to pay for."
Obama was quick to offer praise to Lehrer, though, saying near the end of the debate that he did a "great job."
If you were a wonk, this was the debate for you. Obama and Romney appeared far more at ease comparing policy ratings than with trading zingers.
"The National Federation of Independent Businesses said your plan will kill 700,000 jobs," Romney said at one point, accusing Obama of pushing a plan that would hurt small businesses.
In another, Romney cited two groups -- the Congressional Budget Office and McKinsey and Co. -- as a reason why Obama's health care law was hurting the country.
But Obama had his own insider comeback, pointing to the AARP. "And this is not only my opinion. AARP thinks that," Obama said. "AARP has said that your plan would weaken Medicare substantially."
For a campaign where a new attack line has emerged nearly every week, exactly zero of this campaign's string of catch-phrases made it into the debate.
Obama was silent on "47 percent," the reference to Romney's now-famous critique of Americans who don't pay federal income taxes.
Likewise, Romney didn't touch Vice President Joe Biden's comment from Tuesday, that the middle class had been "buried" the past four years. However, Romney did use the term "buried" in his own comments, and used another, "crushed," three times.
Nowhere in Obama's comments was Romney's private equity firm, Bain Capital, which the Democrat demonizes as a job-killing corporate predator, nor the fact that Romney has personal assets in Swiss bank accounts.
To complete the parade of hits not made, Romney failed to mention this summer favorite, Obama's "you didn't build it" remark referring to small businesses.
The start of the debate offered a light moment: Obama offered anniversary wishes to his wife, first lady Michelle Obama.
The president said 20 years ago, he "became the luckiest man on earth" when they got married.
Calling the first lady "sweetie," Obama said from the debate podium that a year from now, "we will not be celebrating it in front of 40 million people."
Romney offered his congratulations with a touch of humor: "I'm sure it's the most romantic place you can imagine, here with me."