First he was a "knucklehead" now he's a "smarta--." Minnesota Gov. Tim Walz, a Democrat, said Saturday that he was making a joke when he made a comment last week mocking Tesla and its CEO Elon Musk for the company's recent downward trend in the stock market.Walz attempted to clarify his comments during a town hall in Rochester, Minnesota."This guy bugs me in a way that’s probably unhealthy," Walz said, referring to Musk. "I have to be careful about being a smarta--. I was making a joke. These people have no sense of humor. They are the most literal people.""But my