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.?

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