While Joseph Kennedy III carries the most formidable surname in Massachusetts Democratic politics, it’s hard to imagine any other 32-year-old Middlesex County assistant district attorney being treated as a prohibitive favorite for the seat being vacated by liberal icon Barney Frank. But voters who believe that Frank’s values, issue positions, and tireless advocacy served his district and the country well should bet on Kennedy now. He has natural political gifts that make up for his inexperience, and voters can feel confident he will grow into an effective advocate for the district.