are wrong:
http://www.coloradoindependent.com/156870/is-2016-your-first-presidential-caucus-in-colorado-heres-how-it-works
OK, so I’m an unaffiliated voter right now who likes Bernie Sanders or Hillary Clinton, and I want to participate at the precinct caucuses on the Democratic side. What do I need to do?
Unfortunately, you’ve missed your opportunity to participate in the precinct-level caucuses if you didn’t register with a party by Jan. 4. But that doesn’t mean you can’t still go to a caucus location and observe. They’ll likely let you in, but you won’t be able to involve yourself in the discussions.