President Obama may be the leader of the political pack, but it will take work to make sure he holds that title inside the White House with the new First Puppy, Bo. So says dog behavior expert Cesar Millan (a.k.a. The Dog Whisperer), who has some words of advice for Obama, 47, his wife Michelle, 45, and daughters Sasha, 7, and Malia, 10, who unofficially announced their adoption of the Portuguese Water Dog puppy on Sunday. "When I watch President Obama speak, it's clear that calm, assertive energy is something that comes naturally to him," Millan, whose National Geographic Channel...