WASHINGTON - Beset by poor approval ratings and internal differences, congressional Democrats hope to give themselves a triumphant send-off when Congress departs on a monthlong summer vacation. "They can't possibly do all the things they want to do," counters Rep. John Boehner, the House Republican leader. Perhaps not. But Democratic leaders, seven months in power, have set an ambitious agenda for themselves for the next 10 days, even momentarily dispatching their efforts to end the Iraq war to the background. They intend to send President Bush bills to counter terrorism and tighten congressional ethics, measures that were among the party's...