Former Florida governor Jeb Bush now leads the field of Republican candidates for the party’s 2016 presidential nomination, but former secretary of state Hillary Rodham Clinton enjoys a decided advantage over Bush and other potential GOP rivals in hypothetical general election matchups, according to a new Washington Post-ABC News poll. At this early stage in the 2016 competition, the prospective candidates suffer from image weaknesses, but the Republicans have a more acute problem. Most Republicans are not well known, but at this point, not a single one of six Republicans included in the survey has a favorability rating that is...