Gingrch, After Nevada Loss, Says He Will Keep Fighting LAS VEGAS - The morning after losing to Mitt Romney by 25 points in the Nevada caucuses, Newt Gingrich did not sound very conciliatory. "This was a state he won last time, and he won it this time," Mr. Gingrich said Sunday on "Meet the Press" on NBC. Mr. Gingrich vowed to continue his campaign, drawing a clearer contrast between what he described as his own "bold" vision for the country and the "timid" path of Mr. Romney. That promise of a fight-to-the-death battle presents a tactical challenge for the Romney campaign, which does not expect Mr. Gingrich to drop out of the race anytime soon, despite his organizational and financial challenges. Mr. Romney's aides are intent on not allowing Mr. Gingrich's attacks to permanently damage their candidate's standing among conservatives. At the same time, they are wary of responding too directly to Mr. Gingrich, which might only draw more attention to his insurgent candidacy. Mr. Romney, in his Nevada victory speech on Saturday night, chose not to mention Mr. Gingrich or any of his Republican rivals, focusing instead on President Obama. And when Mr. Romney's wife, Ann, introduced him to the large, enthusiastic crowd, she too seemed to be looking ahead, reminding the audience that her husband had been winning states - New Hampshire, Florida and now Nevada - that would be important in the general election. But that does not mean the Romney campaign will treat Mr. Gingrich as the rival who cannot be named. "Governor Romney will continue to focus on Obama, as he did in the speech," said Ryan Williams, a spokesman for Mr. Romney. But we're not going to ignore any candidate. They all have to be taken seriously. That's just the truth. "We still do see him as a serious candidate," Mr. Williams said of Mr. Gingrich. We obviously feel very good about our position, but we have to continue to run a strong campaign. In Nevada, Mr. Romney focused on Mr. Obama and largely eased up on Mr. Gingrich because, aides said, they did not view him as a real threat here. Future contests, however, will be a different story. After a big loss in the South Carolina primary to Mr. Gingrich, the Romney campaign went after him aggressively in Florida, emerging with a decisive victory. Having learned those lessons, Mr. Romney's aides hope to contain Mr. Gingrich and keep the pressure on as necessary. Though Mr. Romney himself may try to stay above the fray, criticizing Mr. Obama rather than Mr. Gingrich, his aides say they will continue to attack the former speaker of the House through surrogates, conference calls and e-mails. On Sunday morning, the Romney campaign sent out just such an e-mail with the subject line "From Las Vegas ... It's a "Flailing" Newt Gingrich," stamping him as an "unreliable leader." And in a sign of confidence, Mr. Romney is scheduled to make a stop later this week in Mr. Gingrich's home state, Georgia. "He has a right to continue on as a candidate, but the walls will start closing in on him," said Eric Fehrnstrom, a top Romney adviser. He's expecting some wins next month, but that might be hard to pull off after suffering a string of losses. You don't win by losing. But Mr. Gingrich outlined his own way forward on Sunday, describing how he could win the nomination by picking off delegates in the contests through February and then doing well in March, when many will be in regions that could be more favorable to him. "Our goal is to get to Super Tuesday, where we're in much more favorable territory," Mr. Gingrich said on "Meet the Press." He said he was well positioned to win in Georgia and other Southern states. Mr. Gingrich is not the only candidate the Romney campaign is taking seriously. Rick Santorum and Representative Ron Paul of Texas have pockets of support in states that have yet to vote. The Romney campaign believes that Mr. Santorum has the potential to do well on Tuesday, both in the Minnesota caucus and in the Missouri nonbinding primary. Mr. Santorum has campaigned in both those states, as well as in Colorado, which also holds a caucus on Tuesday. Mr. Santorum himself predicted strong showings. He came in fourth in Nevada, where Mr. Romney was helped by the operation he put in place four years ago and by the sizable number of Mormon voters. "Now we're getting into states where people don't have the natural advantage," Mr. Santorum said. "This race is a long way from being over," he said on "Fox News Sunday." The Romney campaign canceled a planned stop on Monday in the Minneapolis area, but was careful to dispel any notion that it was ceding ground there to Mr. Santorum, attributing it to "travel demands." Brian Knowlton contributed reporting from Washington.