Last week raised important questions about whether Barack Obama is strong enough to be president. On the domestic political front, he showed incredible weakness in dealing with the Clintons, while on foreign and defense questions, he betrayed a lack of strength and resolve in standing up to Russia’s invasion of Georgia. This two-dimensional portrait of weakness underscores fears that Obama might, indeed, be a latter-day Jimmy Carter. Consider first the domestic and political. Bill and Hillary Clinton have no leverage over Obama. Hillary can’t win the nomination. She doesn’t control any committees. If she or her supporters tried to disrupt...