in college, paul ryan, one of his jobs was, he drove the oscar meier wienermobile. you know what i'm talking about. he and romney have something in common. both have the experience of driving a car with a dog on the roof. never get enough of that. >> any way. letterman's not the only one still needling mitt romney over the shamus on the roof incident. here's president obama. >> he said that new sources of energy like wind are imaginary. governor romney even explained his energy policy this way. i'm quoting here. you can drive a car with a