3 Colorado GOP congressional races decided Tuesday

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Voting is concluding in three Colorado Republican congressional primaries.

The most competitive race is in eastern Colorado's 4th district. Rep. Cory Gardner is vacating the seat to challenge Democratic U.S. Sen. Mark Udall in November.

Weld County District Attorney Ken Buck, Weld County Commissioner Barbara Kirkmeyer, businessman Scott Laffey and state Sen. Scott Renfroe are competing there.

Two incumbent Republican congressmen also face primaries.

In the 5th District in Colorado Springs, retired Air Force officer Bentley Rayburn is challenging Rep. Doug Lamborn.

In the 3rd District in southern and western Colorado, peach farmer Dave Cox is mounting a longshot challenge to Rep. Scott Tipton.