EAU CLAIRE, WIS. -- "People ask me, 'Are you doing this for your future and your career?'" a worked-up Mike Huckabee said to a crowd of about 400 college students in the Green Bay area. "Look, I may be killing my political career," he said. "But I know this, if we don't start thinking about solving America's problems, we're killing all your careers that are standing here today as students, and that's unacceptable." It was an impassioned moment from a candidate who arrived on stage trying out a new batch of lines, which he delivered in a measured, if sometimes...