Bo the Portuguese water dog is cute, fluffy, and has done well growing up in the White House limelight. But he also represents a broken campaign promise. President Obama promised author Jana Kohl, who had been lobbying on Capitol Hill to end puppy mills, that he would adopt a dog. He even posed with her three-legged poodle rescued from an abusive breeder in a photo that was carried on the cover of American Dog magazine. In October 2008, Michelle Obama told Entertainment Tonight that her family would be adopting a shelter dog after the election. The news was welcomed...