Speaking with voters in Oskaloosa, Iowa today, President Obama returned to an old campaign attack theme against Mitt Romney with a joke about his dog Seamus.

“I don’t know if he’s tried that, I know he’s had other things on his car,” Obama said, after pointing out that Romney didn’t like the idea of putting windmills on cars.

Update:

The Romney campaign's Ryan Williams responded to the President's remarks:

“After sanctimoniously complaining about making a “big election about small things” President Obama continues to embarrass himself and diminish his office with his un-presidential behavior. This election is about creating jobs, turning around our economy and helping the middle class. The President’s policies have failed on all counts and he will do anything to distract from his abysmal record.”