Wisconsin Gov. Scott Walker (R) is out with a new ad defending himself against the threat of a possible recall election.

In the ad, called "Promises Kept," Walker argues that he has kept his pledge on jobs, the budget and taxes.

He says that because public employees now contribute more to their pension plans, the state has been able to "keep thousands of firefighters, police officers and teachers on the job" -- likely an attempt to counter the statements of unions that have lined up against him because of his push to strip public workers of most of their collective bargaining rights last year.

Tom Evenson, press secretary for the Friends of Scott Walker Campaign, said the ad will be running statewide, but he declined to disclose how much is being spent.

The Wisconsin Democratic Party recently released its first ad against Walker, comparing him to former President Richard Nixon and the Watergate scandal.

Last month, Democrats turned in more than one million petition signatures in an effort to trigger a recall election of Walker -- far more than the number required. The signatures are still being verified, but both sides are already preparing for a possible recall election.

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