MENTOR, Ohio » Reaching for the finish line, Republican Mitt Romney and President Barack Obama embarked today on the final 72-hour haul of their long, grinding quest for victory, swatting at one another over what should motivate Americans to vote, which candidate they can trust and offering dueling pictures of what the next four years should bring.

Romney opened a three-state campaign day in New Hampshire by faulting Obama for telling supporters a day earlier that voting would be their “best revenge.”

“Vote for ‘revenge?'” the GOP candidate asked, oozing incredulity. “Let me tell you what I’d like to tell you: Vote for love of country. It is time we lead America to a better place.”

The Republican nominee released a TV ad carrying the same message.

Obama, campaigning in the uber-battleground of Ohio, countered with a final reminder that Tuesday’s election is “not just a choice between two candidates or two parties, it’s a choice between two different visions for America.” The president offered himself as the candidate voters can trust, renewing his criticism of Romney for what he said were misleading ads suggesting that automakers were shifting U.S. jobs to China.

“You want to know that your president means what he says and says what he means,” Obama told a 4,000-person crowd in northeast Ohio today. “And after four years as president, you know me.”

The president urged voters in an overflow room to shepherd their friends, neighbors and girlfriends to the polls to vote early, tacking on this very practical caveat: “You should convince them to vote for me before you drag them off to the polls.”

Campaign spokesman Jennifer Psaki said the president’s revenge comment was nothing more than a reminder that if voters think Romney’s policies are “a bad deal for the middle class, then you have power, you can go to the voting booth and cast your ballot.”

Whatever their motivation, 27 million Americans already have cast ballots around the country.

On the last day of early voting in Florida, voters at some sites in Miami-Dade and Broward counties were waiting up to four hours to cast ballots. Sen. Bill Nelson, D-Fla., asked his state’s Republican governor to extend early voting at least through Sunday, citing “an untold number of voters being turned away or becoming too discouraged to vote.”

Before leaving Washington, Obama tended to presidential business as he led a briefing at the government’s disaster relief agency on the federal response to Superstorm Sandy. He said the recovery effort still has a long way to go but pledged a “120 percent effort” by all those involved.

“There’s nothing more important than us getting this right,” Obama said, keenly aware that a spot-on government response to the storm also was important to his political prospects. Then he began his own three-state campaign day.

After holding mostly small and midsize rallies for much of the campaign, Obama’s team is holding a series of larger events this weekend aimed at drawing big crowds in battleground states. Still, the campaign isn’t expecting to draw the massive audiences Obama had in the closing days of the 2008 race, when his rallies drew more than 50,000.

Obama’s closing weekend also includes two joint events with former President Bill Clinton: a rally today night in Virginia and an event Sunday in New Hampshire. The two presidents had planned to campaign together across three states earlier this week, but that trip was called off because of Sandy. And, of course, there is always Ohio.

In a whiff of 2008 nostalgia, some of Obama’s traveling companions from his campaign four years ago joined him on the road for the final days of his last campaign. Among them are Robert Gibbs, who served as Obama’s first White House press secretary, and Reggie Love, Obama’s former personal aide who left the White House earlier this year.

Likewise, virtually Romney’s entire senior team left the campaign’s Boston headquarters to travel with Romney for the contest’s final three days. Their presence for the campaign’s waning hours is an admission that the strategy and planning is largely complete. His schedule has been set, the ads have been placed and Romney’s message has been decided.

The tight inner circle that has worked with him for several years in most cases plan to enjoy the final moments on the campaign trail at Romney’s side.

“It’s been a long road,” Ann Romney told reporters aboard the campaign plane, offering breakfast pastries to Secret Service agents and reporters alike. After campaigning on her own for the past month, she joined her husband for the final swing.

After his morning rally today on the New Hampshire seacoast, Romney had an afternoon appearance in Iowa and two more in Colorado. He shifted an original plan to campaign in Nevada on Sunday in favor of a schedule likely to bring him back to Iowa, Ohio, Pennsylvania and Virginia.

Obama’s itinerary today had him heading from Ohio to Milwaukee and Dubuque, Iowa, and ending the day in Bristow, Va. On Sunday, he was taking his campaign to New Hampshire, Florida, Colorado and, yes, Ohio.

GOP running mate Paul Ryan was in Ohio, too, and he took issue today with Obama’s “revenge” comment.

“We don’t believe in revenge; we believe in change and hope,” he said “We actually do.”

“We’re not just picking a president for the next four years,” Ryan told voters. “We are literally picking the trajectory of this country … for at least a generation.”

Polling shows the race remains a tossup heading into the final days. But Romney still has the tougher path; he must win more of the nine most-contested states to reach 270 electoral votes: Ohio, Florida, Virginia, North Carolina, Colorado, Nevada, Wisconsin, Iowa and New Hampshire.

Romney has added Pennsylvania to the mix, hoping to end a streak of five presidential contests where the Democratic candidate prevailed in the state. Obama won Pennsylvania by more than 10 percentage points in 2008; the latest polls in the state give him a 4- to 5-point margin. Romney will campaign in the Philadelphia suburbs on Sunday. Obama aides scoff at the Romney incursion, but they are carefully adding television spending in the state and are sending Clinton to campaign there Monday.

After months of attack ads, the Obama and Romney campaigns both closed out their campaigns with some upbeat new messages while their allied independent groups continued on a largely negative note.

Obama’s campaign was airing a 1-minute ad, “Determination,” in all the major battleground states. Obama ticks through his plans to boost manufacturing, invest in education and job training, and bring down the deficit in part by asking wealthy people to “pay a little bit more.” A Spanish-language version of the ad was airing in Florida, one of the three states besides Ohio and Virginia that were seeing the most advertising by the Obama campaign in the closing days.

Romney’s campaign was running an ad across the battleground states titled “Clear Path,” which pulled clips from the third presidential debate where Romney laid out how his presidency would differ from Obama’s. In a pitch to women voters, the Republican hopeful’s campaign was also widely airing an ad titled “Extreme” which stresses Romney’s support for abortion rights in cases of rape, incest or when the life of the woman is in danger.

American Crossroads, a major super PAC supporting Romney, was airing a new ad in Denver, Las Vegas and Orlando stressing Romney’s willingness to work across party lines with Democrats. But its largest ad buy for the battlegrounds was “Debate,” where a woman says she doesn’t see how Obama’s second term would be an improvement on the first.

Restore Our Future, another major group supporting Romney, was airing “Flatline,” which compared the economy under Obama to a patient in an emergency room.

Benac reported from Washington. Associated Press writers Julie Pace, Beth Fouhy and Stephen Ohlemacher in Washington, Kasie Hunt and Steve Peoples in New Hampshire, Philip Elliott in Ohio and Suzette Laboy in Miami contributed to this report.