McCaskill plays for veteran support with new ad

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McCaskill announced a "Veterans for Claire" initiative on Wednesday. And VoteVets, a veterans advocacy group, has already spent $200,000 on ads backing McCaskill.

Three Republicans are competing in the primary for the chance to take on McCaskill in November. Conservative super-PACs and the National Republican Senatorial Committee have already indicated they consider McCaskill a top target for 2012.

Watch the ad: