The Colorado Democratic Caucus was a closed caucus , open only to registered voters who registered as Democrats no later than December 5 , 2007 , with the exception of 18-year-olds or new citizens , who could register at the caucus site . The precinct chairs took presidential preference polls of all caucus attendees ; these preference polls were reported to the media . After the preference poll , delegates were then selected among the attendees for each viable candidate , and supporters of nonviable groups could re-caucus into viable groups . Candidates were required to reach a 15-percent threshold for viability within each level of the selection process . Following the local caucuses , county conventions , congressional district conventions , and the state convention , on May 17 , 2008 , were held to finally apportion delegates to the Democratic National Convention
Democratic National Convention
2008 Democratic National Convention
2008 Colorado Democratic caucuses