Sen. John Warner will announce tomorrow at the University of Virginia whether or not he intends to seek a sixth term, according to two top Virginia sources. Warner is planning a 2 p.m. news conference on the grounds of the Charlottesville, Va., school, where he took his law degree over 50 years ago. The Virginian will give his speech near the statue of Thomas Jefferson on the steps of the school’s famous Rotunda, adding a fitting Warner flourish to the event.