WASHINGTON, May 28 — Influential outside advisers to the Bush administration who support the Iraqi exile leader Ahmad Chalabi are pressing the White House to stop what one has called a "smear campaign" against Mr. Chalabi, whose Baghdad home and offices were ransacked last week in an American-supported raid. Last Saturday, several of these Chalabi supporters said, a small delegation of them marched into the West Wing office of Condoleezza Rice, the national security adviser, to complain about the administration's abrupt change of heart about Mr. Chalabi and to register their concerns about the course of the war in Iraq....