President Bush has directed the U.S. military to lead a humanitarian mission to Georgia where tens of thousands have been forced out of their homes following a Russian invasion last week that has been described by Georgia's president as an "ethnic cleansing." A U.S. C-17 aircraft with humanitarian supplies already has arrived in the Georgian capital of Tbilisi and another C-17 will arrive there Thursday with additional medical and humanitarian aid, White House spokeswoman Dana Perino said after the president's announcement. Speaking from the White House Rose Garden with Defense Secretary Bob Gates and Secretary of State Condoleezza Rice, Bush...