Could Colin Powell run against Barack Obama as a Republican and win? The idea is more than a little fanciful. Alma Powell, Colin Powell's wife, has long opposed her husband's political forays. And of course a presidential campaign would be an ordeal for a man Powell's age, his robust health notwithstanding. It doesn't help that there is no clamor for a Powell presidential campaign. Back in 1996, he was seen as an Eisenhower-like figure who could unite Republicans and independents to defeat Bill Clinton. Since then, Powell has alienated Republicans with his sharp criticisms of social conservatives and his support...