“It’s ending purposeless, perpetual, global warfare, stupid.” Republican presidential contenders for 2016 should embrace that campaign theme to demolish the ultra-hawkish Hillary Clinton and her Napoleonic complex. Bill Clinton’s 1992 campaign theme, “It’s the economy, stupid,” is obsolete. Presidential strategists sermonize that voters are instinctively concerned more about jobs, mortgages, and health care than about national security policy. True enough. But that is because presidential aspirants have failed to discern and to explain the direct connection between, on the one hand, purposeless, perpetual, global warfare and the projection of military force everywhere that has created an exorbitant, inefficient, and corrupt...