Earlier this month, video surfaced of Buck at a campaign event before the primary, saying he opposed the 17th amendment, saying it "has taken us down the wrong path." The 17th amendment calls for the direct election of Senators, and Buck quickly retreated, telling The Huffington Post he'd changed his mind.
"It is not a position I still hold and it wasn't a position I held a day later when I called back the guy who asked the question and talked to him about the issue and reflected more on it," Buck said.
The DSCC ad ignores Buck's walk back. "Rewriting the constitution?" the narrator asks, "Ending our right to vote? Ken Buck's just too extreme for Colorado."
The TPM Poll Average for this race shows Buck leading Bennet 45.7%-42.8%.