Is there a State Executive Committee?

Yes. It is made up of The 5 State Party Officers; members of the DNC who live in Colorado; the Chairs and Vice-Chairs of the Congressional districts; and a representative of each of the Initiatives of the State Party. There are also 6 at-Large positions which may be filled by appointment of the State Party Chair

In addition, each county gets one vote per every 10,000 votes cast (or major fraction thereof) for the Democratic candidate for President or Governor, whichever is greater, in either of the previous two elections. Two of these Executive Committee members will be the County Chair and Vice Chair. There is a separate formula for smaller counties that do not meet the threshold set out above.