STEVE INSKEEP, HOST:
It's MORNING EDITION, from NPR News. I'm Steve Inskeep.
RENEE MONTAGNE, HOST:
And I'm Renee Montagne.
The Republican presidential primary season heads into another phase this week, as Colorado and Minnesota voters choose their candidates tomorrow. Over the weekend, Mitt Romney scored a huge victory in the Nevada caucuses, besting his closest rival, Newt Gingrich, by double digits.