Illinois Sen. Barack Obama attracted a huge crowd of 10,000 or more to downtown Oakland Saturday, in his first Bay Area rally. Having glided to the top tier of Democratic candidates on a message of hope, Obama told the crowd his campaign "is a vehicle for your hopes; it is a vehicle for your dreams." But he also used the appearance, before a very sympathetic crowd, to contrast himself with his chief rival for the Democratic nomination, Hillary Clinton. Without naming her, Obama made an issue of Clinton's much criticized 2002 vote to authorize the war in Iraq, for which...