LAS VEGAS — Now it’s on to Colorado, Minnesota and Maine.

With back-to-back victories fueling him, Republican presidential front-runner Mitt Romney is looking toward the next states that hold GOP nominating contests as main rival Newt Gingrich brushes aside any talk of abandoning his White House bid, all but ensuring the battle will stretch into the spring if not beyond.

Shortly after losing big to Romney here, the former House speaker emphatically renewed his vow to campaign into the party convention in Tampa this summer. His goal, he said, was to “find a series of victories which by the end of the Texas primary will leave us at parity” with Romney by early April.

Gingrich continued to shrug off Nevada’s caucus results in an appearance on Sunday on NBC’s Meet the Press.”

“This is the state he won last time, and he won it this time,” he said of Romney. “Our goal is to get to Super Tuesday where we’re in much more favorable territory.”

But first, Gingrich must make it through Colorado and Minnesota, which both hold caucuses Tuesday. Maine follows on Saturday during a month that promises to be as plodding as January was rapid-fire in the presidential race. Romney will look to maintain his position of strength, if not build upon it, as his rivals continue working to derail him even as their options for doing so narrow with each victory he notches.

The former Massachusetts governor held a double-digit lead Sunday morning over his nearest pursuer as the totals mounted in Nevada, where fellow Mormons accounted for roughly a quarter of all caucus-goers. Gingrich and Texas Rep. Ron Paul vied for a distant second. Former Pennsylvania Sen. Rick Santorum trailed the field.