Secretary of State Mike Coffman (R) is on the air in his bid to replace retiring Rep. Tom Tancredo (R) in the GOP-leaning, suburban Denver 6th district.

Coffman is spending $65,000 to air a 30-second biography spot on cable television throughout the 6th district. The ad is set to run through May 25.

“This first ad seeks to inform the voters of Mike’s unique blend of business, military, and government experience, and make the case that Mike is the most prepared and qualified candidate to serve us in the United States Congress,” Coffman campaign spokesman Dustin Zvonek said in a statement.

“He’s a proven conservative leader who led Marines in combat during the first Gulf War, and volunteered to serve again in Iraq,” the voiceover says as the ad opens.

Coffman is running in a competitive Aug. 12 GOP primary against businessman Wil Armstrong (R), the son of former Sen. Bill Armstrong (R-Colo.); and state Sens. Ted Harvey and Steve Ward.

— David M. Drucker