GOP Senator Rick Santorum -- who's trailing Dem Bob Casey in recent polls -- has now called in the Rudy Giuliani cavalry. He's just released a new ad featuring Rudy that's set in a firehouse (not exactly an original choice of setting for an ad featuring Rudy) and shows firemen sitting in rapt silence as Rudy says of Santorum: "When he tells you what he thinks, you know that it's coming from his mind and his heart and his conscience. It's not just something that you want to hear." The ad appears to be trying to take two two of Rudy's best-known perceived strengths -- his post-9/11 association with first responders, and his alleged tendency to say what he thinks -- and transfer them over to Santorum.

Update: Post edited slightly from original.