There are a lot of obstacles to an Obama-Clinton "unity ticket." Maybe she doesn't want to be vice president. Maybe they or their staffs or their spouses can't get along. Maybe Clinton can't offer sufficient assurance of loyalty and subordination, or a practical plan to eat many unfortunate words she said about Obama during the primary competition. But if these obstacles can somehow be overcome, Obama should ask her to run with him, and she should accept. I know this is a deeply unpopular, even infuriating, suggestion to many Obama supporters who've watched the Clinton campaign savage their champion for...