Texas Gov. Rick Perry has leapt to the top in the Republican presidential race. His domestic policy looks standard-issue conservative. But his foreign policy veers neoconservative—even after George W. Bush and Barack Obama together launched two full-scale wars, one “kinetic military action,” and two deadly drone-campaigns. With the economy stuck in the doldrums, President Obama faces a potentially difficult reelection fight. However, it will take someone to beat him, and so far the leading Republicans do not impress. In a party that tends to practice political primogeniture, Mitt Romney was early anointed the front-runner. Yet dissatisfied GOP voters rushed to...