The chairman of the independent Sept. 11 commission called on President Bush on Thursday to become personally involved in pressuring Congress to overhaul the nation’s intelligence community, warning that the legislation recommended by the panel might die in Congress without Mr. Bush’s intervention before the election next month. “I’m very worried,” said the chairman, Thomas H. Kean, a former Republican governor of New Jersey. “I think it’s a 50-50 situation now. We’ve come a long way; we’re right up to the finish line. But we have some powerful adversaries.” Full Story