WASHINGTON, Aug. 22 — The federal judge who ruled last week that President Bush’s eavesdropping program was unconstitutional is a trustee and an officer of a group that has given at least $125,000 to the American Civil Liberties Union in Michigan, a watchdog group said Tuesday. The group, Judicial Watch, a conservative organization here that found the connection, said the link posed a possible conflict for the judge, Anna Taylor Diggs, and called for further investigation. “The system relies on judges to exercise good judgment, and we need more information and more explanation about what the court’s involvement was in...