Stephanie S. Cordle/Associated Press Jenna Bush, campaigning for her father last week, makes an unintended splash. WASHINGTON — Well, that was a fine how-do-you do. This was supposed to be the new Jenna Bush. Fresh out of college, ready to shed the "Jenna and Tonic'' image she earned as a partying undergraduate, she posed for Vogue in a couture gown and declared an interest in working with charter schools. It was all a prelude to becoming a public figure at 22 and heading out on the campaign trail for Dear Old Dad. Then last week she stuck out her...