(CNN)-- On the biggest day of Republican primary voting since last month's Super Tuesday, the certain GOP presidential nominee and the incumbent president he hopes to unseat both appeared to be in full general election mode.
Mitt Romney planned a speech Tuesday night in New Hampshire that his campaign said would signal the virtual conclusion of the GOP primary campaign, while President Barack Obama emphasized the themes of equal opportunity and Republican intransigence in courting the youth vote in speeches on college campuses.
With five states holding primary elections, the only drama left appeared to be the size of the margins of victory for Romney in his march toward the 1,144 delegates needed to clinch the Republican nomination to take on Obama in November.
Voters cast ballots in New York, Pennsylvania, Connecticut, Delaware and Rhode Island. While he continues to campaign in primary states along the road to the nomination, Romney now has his eyes on a larger prize: the White House.
Of the five states voting Tuesday, Pennsylvania is the only one where Romney could be competitive against Obama.
"I'd like you to go out and vote in your primary and give me your support and show that we're ready and willing to take on President Obama and then I want you to work over the summer to get your friends to think about voting," Romney said Monday at a campaign event near Pittsburgh. "I need your help for November 6. So you need to get your friends to vote. You need to pull them out."
Far ahead of the field in the battle for delegates, Romney became the presumptive nominee April 10 after his closest rival, former Sen. Rick Santorum of Pennsylvania, suspended his campaign. Even though former House Speaker Newt Gingrich and Rep. Ron Paul of Texas continue their long-shot bids for the White House, the party appears to be consolidating around Romney.
According to a CNN estimate, Romney has 695 of the 1,144 delegates needed, with Santorum holding 273 delegates, Gingrich with 141 and Paul with 72. By CNN's count, the earliest Romney could reach the nomination threshold is late May, while Obama already clinched the Democratic nomination as expected.
Gingrich told NBC on Monday that he would "reassess" his campaign depending on how he finishes in Delaware, a winner-take-all state in which he has campaigned for several weeks.
"I think we need to take a deep look at what we are doing," Gingrich told NBC. "We will be in North Carolina tomorrow night and we will look and see what the results are."
Gingrich had previously said he would stay in the race until Romney reached the 1,144-delegate mark. He said Monday he hoped to do well in Delaware -- "either carry it or come very, very close."
Paul told CNBC Monday that he won't step aside even if Romney soon clinches the nomination.
"If tomorrow, Romney had the absolute number, I would probably continue in a modified way to maximize the number of delegates to go to the convention," Paul said on "Squawk Box," adding that his supporters insist he stay in the running.
"What is remarkable is how much this race has changed now that it has become a general election contest between Mitt Romney and President Obama," Republican strategist and CNN contributor Alex Castellanos said. "The pathetically small GOP contest has been left behind."
"It has been replaced by a much larger election about two dramatically different views about what kind of country we are going to be and whether fairness or growth is our biggest problem," added Castellanos, who was a top media adviser for Romney's 2008 nomination bid but who is not taking sides this cycle.
Romney planned a series of fund-raising events Wednesday and Thursday in New York and New Jersey, signaling his shift to general election mode after the latest primaries.
"Each fund-raising event is important as we go towards the general election. He has been having much success in fund-raising," said Phil Rosen, a major Romney contributor and co-host for a New York event. "There are two pieces of the puzzle: Extreme dissatisfaction with President Obama. Second part: giant appeal of Gov. Romney on all aspects of the presidency."
Obama, meanwhile, delivered a fiery speech to college students Tuesday on holding down federal student loan rates, taking up an issue important to young voters by saying he wants them to have a fair shot at a degree without taking on a mountain of debt.
At the University of North Carolina, Obama recounted how the student debt he and first lady Michelle Obama owed after getting married exceeded their first mortgage.
Without naming Romney, Obama sought to distinguish his background from that of the multimillionaire businessman and former Massachusetts governor.
"This is something Michelle and I know about firsthand," Obama said of student debt, pausing amid cheers and laughter from the energetic crowd. "I just want everybody here to understand. ... I didn't just read about this. I didn't just get some talking points about this. I didn't get some policy briefing on this. Michelle and I -- we have been in your shoes. Like I said, we didn't come from wealthy families."
Obama will also visit the University of Colorado later Tuesday, followed by a visit Wednesday to the University of Iowa, to push for extending lower student loan rates.
All three universities are in states Obama narrowly won in the 2008 election, which are considered battleground states again in 2012. In addition, the president will appear on the "Late Night with Jimmy Fallon" show Tuesday to discuss the issue.
Five years ago, rates for the popular student loan program were lowered to 3.4% from 6.8%. Without an extension, the lowered rates are set to expire on July 1 and return to 6.8%.
In North Carolina, Obama urged the student audience to tweet members of Congress the message: "Don't double my rate."
"At this make or break moment for the middle class, we've got to make sure that you're not saddled with debt before you even get started in your life," Obama said to cheers.
In a rare show of agreement with Obama, Romney said Monday he supports extending the lowered loan rates for low- and middle-income undergraduates.
"With the number of college graduates who can't find work or who can only find work well beneath their skill level, I fully support the effort to extend the low interest rate on student loans," Romney said before a campaign event in Astor, Pennsylvania.
Last year, when asked about the rising cost of higher education, Romney suggested that market forces would lead some colleges to lower the price of receiving an education in order to compete in attracting cost-conscious students.
Senate Republican leader Mitch McConnell, R-Kentucky, indicated Tuesday that an agreement would be worked out in view of the support for extending the lower loan rate by both Obama and Romney.
Romney needs to overcome a big Obama advantage among young voters. In 2008, voters aged 18 to 29 supported Obama over Republican nominee Sen. John McCain by 66% to 32%, according to CNN exit polling.
Obama has maintained his lead among the group, according to the latest CNN/ORC International poll, with 64% support to Romney's 32%.
Rep. Aaron Schock of Illinois, a Romney surrogate who is currently the youngest member of Congress, argued Tuesday that Obama's rhetoric has not translated into a better culture for young voters.
"The reality is there's not been opportunity for young people as they've graduated from college," Schock said on a conference call with reporters organized by the Romney campaign. "Half of the young people who graduated last year are still unemployed or underemployed. Nearly the same percent still live with their parents."
Of the five states holding primaries Tuesday, New York is the largest with 92 delegates at stake, followed by Pennsylvania's 54 delegates. Also voting Tuesday are Connecticut with 25 delegates, Delaware with 17 delegates and Rhode Island with 16.
Romney has campaigned in all five states over the past couple of weeks. Even if he were to win all 204 delegates up for grabs Tuesday, Romney won't have enough to formally clinch the nomination, which is most likely to happen next month.
Romney will spend primary night in New Hampshire, the state that traditionally holds the first-in-the-nation primary. In January, Romney won big in New Hampshire, which also is a crucial general election battleground state.
The former governor of neighboring Massachusetts owns a vacation home in New Hampshire. Romney announced his presidential exploratory committee with a video from the Granite State in April 2011 and formally announced his campaign at an event there last June.
"Tuesday will mark the semi-official end of the primary campaign and Romney will become the presumptive nominee. The campaign will come full circle in New Hampshire," said a Romney campaign official, who declined to be identified discussing campaign details.
Another sign of a campaign in transition from primary to general election mode is team Romney's coordination with the Republican National Committee. While the campaign has begun joint general election fund-raising with the RNC, a Romney sweep of Tuesday's contests would bring further coordination, a Romney adviser told CNN.
As for drama, there's still one very important contest to come.
"There is only one primary left -- the VP primary -- and Mitt Romney has the only vote," Castellanos said.