Conservatives such as Doug Bruce might be grumbling about bipartisan ballot measures to tackle gerrymandering, but U.S. Rep. Ken Buck put his uber-conservative stamp of approval on amendments Y and Z in a new TV ad.

Buck is a member of the U.S. House Freedom Caucus, the lawmakers usually the farthest to the right.

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The twin amendments would create independent commissions to draw, respectively, boundaries for congressional and legislative districts.

“Amendments Y and Z take the power of drawing maps away from political insiders and unelected judges and give it to an independent commission. No lobbyists. No politicians. Political maps written by the people for the people,” Buck says in the ad.

The ad is part of a six-figure buy – online and in TV markets across the state – to pass the two measures on the Nov. 6 ballot, which will be mailed out in a little under two weeks.

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Republican donors to Fair Maps include such well-known Republicans as Pete Coors, Larry Mizel, Dan Ritchie, Terri Stevenson, Heidi Ganahl, and Chad and Troy McWhinney.

Lawmakers unanimously referred the amendments to the ballot last spring, and the bipartisan organization trying to pass it, Fair Maps Colorado, has rounded up almost 300 endorsements, including every living former governor and nearly all the state’s major newspapers, according to the group.