Republican Senate candidate Cory Gardner is going after Democratic senator Mark Udall for voting for Obamacare in a new TV ad. The 30-second spot shows the GOP congressman holding up a cancellation letter he received from his health insurance provider.

"When Mark Udall voted for Obamacare, he promised us if we liked our health care plan, we could keep it. Well, you know how that worked out," Gardner says in the ad. "I got a letter saying that my family's plan was canceled. 335,000 Coloradans had their plans canceled, too."

Gardner closes by urging voters to "shake up the Senate." Watch the ad below:

Gardner is in a tight race with Udall, with the Democrat holding a slight lead in the poll average. While Udall looked weak in polls earlier this year and Gardner entered the race in the spring even ahead in a few polls, Democrats have hit the Republican congressman with ads referring to his past support (in the state legislature) for a controversial "personhood" amendment and casting Gardner as an extremist on social issues.

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