The Club for Growth is back on the air in its effort to take down Sen. Robert Bennett (R-Utah).

The latest ad hits Bennett for voting for the bailout and the Bridge to Nowhere. It also notes he "sided with big-government liberals" in his health care proposals.

The Club is not backing a particular candidate in the Republican field to face Bennett, but it is opposing Bennett's re-nomination. Attorney Mike Lee, former congressional candidate Tim Bridgewater and activist Cherilyn Eagar are currently challenging Bennett.

The ad closes by encouraging voters to caucus on March 23.

UPDATE: Club spokesman Mike Connolly wouldn't disclose the size of the ad buy but said: "We are buying everything in the state that Fox News will sell us."