Rep. Doug Lamborn, Colorado's longest-serving Republican congressman, has fended off a primary challenge in the state's most Republican district.
Lamborn beat Colorado Springs businessman Robert Blaha. With 87 percent of the projected vote counted, Lamborn was leading 61 percent to 39 percent Tuesday.
A three-term incumbent, Lamborn was the only incumbent congressman from Colorado facing a primary Tuesday. Lamborn's victory all but assures he will return to Washington for a fourth term. Colorado 5th Congressional District is the state's most Republican, according to party registration, and has not chosen a Democrat since its creation 40 years ago.