Republican presidential hopeful former Massachusetts Gov. Mitt Romney chats with California Gov. Arnold Schwarzenegger discuss a question during a Republican presidential debate in Simi Valley, Calif., Wednesday, Jan. 30, 2008. (AP Photo/Mark Terrill)AP - Republican presidential candidate Mitt Romney plans to run a “significant” level of television ads in California and other states that vote Tuesday in essentially a national primary, aides said Thursday, signaling a willingness to aggressively try to derail Republican front-runner John McCain.


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