DENVER (AP) -- Colorado's caucuses offer the Republican candidates for president a glimpse of their support in the Mountain West.
Colorado has enjoyed top billing for presidential candidates in recent years, largely because of its toss-up status. Colorado's registered voters have been divided nearly evenly among Democrats, Republicans and independents, though the GOP has an advantage this year.
The Centennial State has never been much of a player in the nominating game. Republicans hoped to change that by moving up their presidential precinct caucuses by a month.
Tuesday's caucuses aren't binding. Most of Colorado's 36 Republican National Convention delegates won't actually be assigned until after a state GOP assembly in April.
Front-runner Mitt Romney plans to spend caucus night in Denver. Newt Gingrich, Rick Santorum and Ron Paul all campaigned in Colorado.