WASHINGTON, Nov. 9 - The White House offered only lukewarm support today for Senator Arlen Specter, the Pennsylvania Republican whose bid to become chairman of the Senate Judiciary Committee is under fire from conservatives. Asked whether President Bush would have confidence in Mr. Specter as chairman, the chief White House spokesman, Scott McClellan, said the chairmanship was "a matter for the Senate to decide, and it's something that the White House does not have a role in.'' Advertisement "Senators will make that decision," he said. The White House does, of course, have influence. By virtue of , Mr. Specter is...