This is the first in a five-part series detailing the risks to American national security if Barack Obama (or Hillary Clinton) should ever choose to let Richard Clarke back into government. Clarke is currently one of Obama’s top national security advisors. At the beginning of the campaign season, top Democratic candidates scrambled after Clinton national security veterans with almost as much urgency as the U.S. and the Soviets once pursued German rocket scientists. In either case, the winner would corner a certain market on national security expertise, a virtue in glaringly short supply among top Democratic candidates in this year’s...