The wholesale absorption of Hillary Clinton’s best and brightest campaign advisers has begun. In the weeks since Mrs. Clinton officially suspended her candidacy, the Obama campaign has recruited the services of the Clinton campaign’s director of national security, Lee Feinstein, as well as foreign-policy advisers Mara Rudman, the deputy national security advisor under Bill Clinton; Robert Einhorn, a former assistant secretary for nonproliferation at the State Department; and Stuart Eizenstat, an international-trade specialist who was policy director for Jimmy Carter’s 1976 campaign.