President Bush named seven people Friday to sit on an independent study commission to look into intelligence failures on Iraqi weapons, choosing former Democratic Sen. Charles S. Robb and retired judge Laurence Silberman, a Republican, to head the panel. "We must stay ahead of constantly changing intelligence challenges," Bush said. "The stakes for our country cannot be higher." Robb was a former U.S. senator and governor of Virginia and son-in-law of the late President Johnson. He is married to Lynda Baines Johnson and has been practicing law since leaving the Senate. Silberman is a conservative who served as deputy attorney...