KUSA - Monday, January 4 is the deadline for Coloradans to register with either the Republican or Democratic party to participate in the March 1 presidential caucuses.
Despite the fact that Colorado law allows same-day voter registration for elections, the caucuses are different.
Voters must affiliate with the party two months beforehand in order to participate in the caucuses.
Colorado allows voters to register and update their voter information online.
In order to take part in a caucus, you'll need to register with a party affiliation before midnight.
More than a third of voters in Colorado are not affiliated with a political party, and hence ineligible to participate in caucuses.
Even those who do affiliate are unlikely to take part.
In the 2012 presidential cycle, fewer than ten percent of Republicans participated in the caucuses. Rick Santorum was declared the winner, though Mitt Romney would go on to win the nomination.
There'll be no winning GOP candidate this year in Colorado. The state party decided to eliminate its presidential preference poll, which may lead to a drop in attendance this year.
Democrats will declare a winner in Colorado on March 1.
There's more going on in the caucuses than picking favorite candidates.
For both parties, the caucuses are the first step in selecting convention delegates to cast Colorado's votes for a presidential nominee.
The March 1 caucuses are essentially small neighborhood meetings which will choose delegates to county conventions. That leads to a selection of delegates to the state conventions and eventually the parties' national conventions.
Caucuses take place at 7 p.m. on Tuesday, March 1.
While state law does influence how the caucuses happen, they are not official state elections.
(© 2016 KUSA)