ABC Supreme Court correspondent Jan Crawford Greenburg is reporting that the White House has narrowed the list of possible successors to Justice Souter to six candidates, with Judges Sonia Sotomayor (2d Circuit) and Diane Wood (7th Circuit) and Solicitor General Elena Kagan at the top of the list.  According to Greenburg, Chief of Staff Rahm Emanuel is pushing Sotomayor, while other White House staff urge that either Kagan or Wood would be better at building coalitions among the justices.