Santorum victories rattle race

MINNEAPOLIS, Minnesota - Christian conservative Rick Santorum's unexpected trio of state wins has reignited his White House bid and raised new question marks over Republican front-runner Mitt Romney.

Santorum, written off only a few weeks ago, won caucuses in Minnesota and Colorado and a primary in Missouri on Tuesday - a clean sweep that represented another stunning turnaround in this topsy-turvy Republican presidential race.

The established wisdom was that Santorum was surging in the Midwest and could take Minnesota and Missouri thanks to support from evangelical Christians, but no one expected him to win out west in the Rocky Mountains.