Roller-Coaster GOP White House Race [VIDEO]

From the start, it's been a roller-coaster race for the Republican presidential nomination. GOP primary voters can catch their collective breath for the next two weeks.

Romney narrowly won Maine's Republican caucuses yesterday, giving his presidential campaign a much-needed boost after humbling losses in Colorado, Minnesota and Missouri earlier in the week.

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Romney captured 39 percent of the vote to Ron Paul's 36 percent.

The next contests, in Arizona and Michigan, aren't until Feb. 28. The party with a reputation for order may have it sorted out after March 6, when 10 states get their say. But that would break sharply with this race's tendency toward uncertainty.

With nine contests down, Mitt Romney leads the delegate hunt, and has both the money and the organization to compete deep into the state-by-state nomination calendar. But his two main rivals have scored decisive victories, putting into doubt the strength of the former Massachusetts governor's front-running candidacy.

Santorum Says He'll Be In 2-Man Race With Romney

Rick Santorum says he expects to do well in the next GOP presidential contests and will be in a two-man race with Mitt Romney.

Santorum is coming off victories last week in Colorado, Minnesota and Missouri, and says he can have good showings Feb. 28 in Michigan and Arizona.

The former Pennsylvania senator says he's the latest candidate to challenge front-running Romney and he says Romney is having trouble figuring how to go after a rival who is a "solid conservative" with the ability to win support from independents and Democrats.

Santorum tells ABC's "This Week" that Romney has won in some states by "beating the tar" out of his opponents on massive television ad spending. Santorum says Romney won't have such a fundraising edge over President Barack Obama.

(Copyright 2012 by The Associated Press. All Rights Reserved.)