WASHINGTON -- Senator Edward M. Kennedy said yesterday that President Bush's Iraq policy is ''ridiculous" and disputed Bush's statement that the 2004 reelection validated the war. Iraq is ''Bush's Vietnam," Kennedy said. Bush, in an interview with The Washington Post published yesterday, said, ''The American people listened to different assessments made about what was taking place in Iraq, and they looked at the two candidates, and chose me." Kennedy, asked about Bush's comment on CBS's ''Face The Nation," noted that then-President Lyndon Johnson was easily reelected during the Vietnam War but did not seek reelection in 1968. ''Look what happened,"...