Barack Obama sought to close the deal with American voters yesterday as he heralded the dawn of a new politics that will heal divisions, appeal to “our better angels” and restore a sense of “higher purpose”. His speech in Canton, Ohio, was designed to frame the final days of an often bitterly fought presidential contest around the uplifting themes he had emphasised at the outset of his campaign. While he was at pains to tell supporters that they cannot afford to “let up for one day, one minute or one second”, Mr Obama told an exultant crowd: “In one...