CANDIDATE FOR TREASURY Gary Edson, who as deputy national security adviser to President Bush angered economic conservatives, is reported by Bush insiders as trying to be named deputy secretary of the Treasury under Secretary-designate John Snow. Assigned the area of international economic affairs, Edson has been a leading proponent of the Bush administration taking a forward position on global warming. He is a veteran bureaucratic infighter who held high staff positions in the Reagan and first Bush administrations. A footnote: Supply-siders are pushing investor Lewis Lehrman, the Republican nominee for governor of New York in 1982, for a high post at the Treasury. He would satisfy the argument that Snow, renowned as a deficit hawk, needs a prominent tax-cutter at the Treasury. WHERE IS HALEY? Delta Airlines, facing Transportation Department opposition to badly needed help, is complaining about the absence of its high-priced Washington lobbyist: former Republican National Chairman Haley Barbour. Transportation Secretary Norman Mineta is against Delta's bid to join a cooperative market agreement with United Airlines and Continental Airlines. The Treasury Department has approved the deal. Barbour, one of the capital's most influential lobbyists, is busy these days in his home state of Mississippi preparing his 2003 campaign for governor. Delta executives are privately complaining that their man in Washington is AWOL.