HATCHET-MEN ARE NOT WITHOUT A SENSE OF HUMOR…. In Nevada’s U.S. Senate race, a new ad from the Karl Rove-affiliated group Crossroads GPS asks voters, “Are you tired of all these negative political ads?”

It’s almost amusing.

The ad pretends to be a positive spot, complete with a squealing-brakes sound effect and a rhetorical “Are you tired of all these negative political ads?” Of course, Crossroads GPS is an anonymous money mill, and there’s no sense in “wasting” undisclosed funds on a positive spot. So the ad quickly pivots back to the same old misinformation about Democratic policies. It’s a rare beast: a negative attack ad that decries negative attack ads.

I’d go just a little further still — a group that specializes in running almost nothing but deceptive and negative attack ads, created in part by a GOP hatchet-man who specializes in crafting nothing but deceptive and negative attack ads, is running a spot that’s deceptive and negative, asking voters, “Are you tired of all these negative political ads?”

Down the rabbit hole we go.

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.