Retired Marine Corps Gen. Anthony Zinni will serve as a mediator between Israelis and Palestinians as they work to implement a cease-fire, Secretary of State Colin Powell announced today. In a speech today at the University of Louisville in Kentucky, Powell said Israel and the Palestinian Authority were forming senior-level committees to conduct the negotiations. Powell said he asked the former commander-in-chief of U.S. Central Command "to go to the region and remain in the region to work with these...