Republican candidates are descending upon Colorado Monday, as the state gets its moment in the national spotlight.

The Colorado caucus will be held Tuesday, and GOP candidates are wasting no time making a last pitch to voters.

Frontrunner Mitt Romney, with two straight victories under his belt, is looking for Colorado to strengthen the aura of inevitability that has begun enveloping him since his commanding Florida win over Newt Gingrich last week. Romney won the state in 2008.

Romney held a rally in Colorado Springs Saturday, and is criss-crossing the state Monday, hitting both Grand Junction and Centennial.

Gingrich is seeking to pry some delegates from Romney, as Colorado is not a "winner take all" state. He'll be in Golden for two events: one at 11:30 a.m. at the Denver West Marriott, then at 2 p.m. he'll be at the Election Energy Summit at the School of Mines.

Gingrich, who briefly became the GOP frontrunner after winning South Carolina, maintains he is looking ahead to Super Tuesday in March, when the Southern states he's likely more competitive in will join in on the election process. Four hundred delegates are up for grabs then. The handful of caucuses and primaries held in February are widely expected to favor Romney.

Rick Santorum, presenting himself as a conservative alternative to Gingrich, will also be attending the Election Energy Summit.

Ron Paul, who made a stop in Colorado Springs while in the state last week, will return to Colorado Tuesday.

Most of Colorado's 36 delegates won't be assigned until April.