As his formidable campaign marches inexorably toward the nomination, Mitt Romney should learn a vital lesson from the guy who beat him in his first race for public office: Sen. Ted Kennedy. In 1980, Teddy lost his own bid for the presidency because he couldn’t answer a simple question about why he wanted the job. Like Kennedy, Romney could undermine his confident drive to unseat a stumbling incumbent unless he prepares clear, concise, and forceful responses on what he means to do with the office he seeks. Near the end of the disastrous Jimmy Carter administration, most analysts expected an...