Debates are high-pressure, high-risk events, and they often offer low rewards. A candidate's first goal is not to win the debate, but rather not to lose -- to do no harm to the campaign. A simple misstep can change the course of an election. The first debate was a clear win for former Gov. Romney, who appeared more interested and engaged than President Obama, who appeared aloof, disinterested and arrogant. The difference in their performances -- each standing at a lectern -- enabled Romney to gain momentum in the polls. In their second meeting, they prowled around stage, often circling...