Something I learned during the first two years of the Obama administration, when the staff infighting was at its worst: if you wanted to get somebody to say something nice, ask them about Ron Klain. Klain entered the administration as Vice President Joe Biden's chief of staff. This was, itself, notable: Klain has been chief of staff to Vice President Al Gore, too, making him the only person to serve in that position for two different vice presidents. But the esteem for Klain wasn't based on his resume. Rather, he had a mix of policy, political and bureaucratic chops that...