DENVER — Former U.S. Rep. Bob Beauprez is making his first live pitch to Republican voters Thursday at a Republican gubernatorial debate.

Three of the four candidates challenging Democratic Gov. John Hickenlooper will participate in the KUSA debate — Beauprez, Secretary of State Scott Gessler and former state Sen. Mike Kopp. Former U.S. Rep. Tom Tancredo says he won't debate fellow Republicans.

Beauprez has yet to make a personal pitch to fellow Republicans, having skipped the state assembly.

The debate comes a day after a poll suggested Hickenlooper leads his potential Republican challengers.

The poll from Quinnipiac University said that 52 percent of Colorado voters approve of the job Hickenlooper is doing.