The Local newsletter is your free, daily guide to life in Colorado. For locals, by locals.
The non-partisan Bay Area Center for Voting Research has ranked the most conservative cities in the country. In the category of cities with more than 100,000 people, Colorado Springs ranked sixth in the nation.
Several other Colorado cities were far less conservative:

5280 is here to guide you through Denver—where to eat, drink, and travel in and around the city.
Get 1 Year for $19.95 ›
Arvada (61); Westminster (79); Lakewood (85); Pueblo (107); Fort Collins (108); Aurora (161); and Denver (189).
Statistics from the 2004 presidential race were used to compute the rankings.
