The 2008 Colorado Democratic presidential caucuses took place on Super Tuesday, February 5, 2008. As he did in every other state that held a caucus rather than a primary, Barack Obama won the caucus by a wide, two-to-one margin over Hillary Clinton.

Super Tuesday 2008, Super Duper Tuesday, Mega Tuesday, Giga Tuesday, Tsunami Tuesday, and The Tuesday of Destiny are names for February 5, 2008, the day on which the largest simultaneous number of state U.S. presidential primary elections in the history of U.S. primaries were held. Twenty-four states and American Samoa held either caucuses or primary elections for one or both parties on this date. Furthermore, the week-long Democrats Abroad Global Primary began on this day.