Bristol Palin Sarah Palin’s 19-year-old-daughter and unwed mother of 4-month-old Tripp has been blog-blistered this week for her debut as an Abstinence Ambassador for the Candies Foundation. She made the rounds of the morning shows, appeared at a town hall meeting for National Teen Pregnancy Awareness Day and declared herself committed to discouraging behavior that would leave other girls in the same predicament she finds herself in. “Regardless of what I did personally,” she told Chris Cuomo on Good Morning America, “abstinence is the only …