WASHINGTON – The Republican presidential campaign rolled westward Wednesday, Mitt Romney riding herd after his Florida primary victory, Newt Gingrich looking for a new stake and a top party leader insisting the long trail won’t necessarily hurt the GOP in the race against President Obama.

Already the television ads were showing up in states that vote next: caucuses in Nevada on Saturday, in Minnesota and Colorado next Tuesday, and in Maine the following weekend.

Romney is favored in Nevada, where there are 28 Republican National Convention delegates at stake. And, alone among the contenders, he appears to have the money to compete aggressively in all the other states as well.

Gingrich was conceding nothing. Routed on Tuesday night, the former House speaker vowed to stay in the race until the party convention.

The Florida campaign was marked by millions of dollars in negative ads, and Gingrich’s promise to remain in the race raised the prospect of a months-long struggle. But current House Speaker John Boehner said he was not concerned.

“I would remind people that President Obama and Secretary of State Hillary Clinton had a fight that went through June of 2008. I think everybody just needs to realize that this will resolve itself,” he said.

Jubilant in victory on Tuesday night, Romney was thrown onto the defensive the day after. “I’m not concerned about the very poor” because they have a social safety net, he said on CNN. Criticized quickly, he hastened to clarify.

“No, no, no, no, no, no, no,” Romney told reporters on his campaign plane when asked about the comments. He referred back to his complete remarks, in which he had said he would focus on middle-income Americans rather than the very poor, who get government help, or the very rich, who don’t need it.

“My energy is going to be devoted to helping middle-income people,” he said.

By then, though, he was drawing criticism from conservatives who worried he was showing a penchant for verbal gaffes.

Gingrich piled on. “I am fed up with politicians in either party dividing Americans against each other,” he said.

After making no significant campaign effort in Florida, former Sen. Rick Santorum and Texas Rep. Ron Paul looked for better days in the contests just ahead.

Santorum picked up an endorsement from former Colorado Rep. Tom Tancredo, known for his hardline position on immigration.

Eager to emerge as the leading conservative in the race, Santorum said Gingrich was nearing the end of his run. “If Newt’s out of the race, all his votes come to me,” he said, mirroring what the former House speaker frequently says about him.

Paul, campaigning in Las Vegas, said he favors an immigration policy that doesn’t rely on “barbed wire fences and guns on the border.”

Appearing before an audience of Hispanics, he said he opposes illegal immigration but also is against any effort to round up and deport individuals who are in the United States illegally.