The population is centered around decently sized cities: https://www.govtrack.us/congress/members/CO#map https://www.govtrack.us/congress/members/CO#map https:

The population is centered around decently sized cities: https://www.govtrack.us/congress/members/CO#map https://www.govtrack.us/congress/members/CO#map https://en.wikipedia.org/wiki/List_of_municipalities_in_Colorado https://en.wikipedia.org/wiki/List_of_municipalities_in_Colo... And it's only fairly recently: https://en.wikipedia.org/wiki/United_States_presidential_elections_in_Colorado https://en.wikipedia.org/wiki/United_States_presidential_ele... https://en.wikipedia.org/wiki/List_of_United_States_senators_from_Colorado https://en.wikipedia.org/wiki/List_of_United_States_senators... When you have a state like Utah next door it might pull a large portion of the religiously Republican. I don't live in, or near, Colorado though.