Crews rescue 2 teens trapped in Wash. snow field   Officials: Threat sent to McCain's Colorado office   Texas man gets life for child sex club conviction   Student killed in shooting at Tenn. school   AP NewsAlert   LEAD: Noda decides against running for president of opposition DPJ+   LEAD: Gov't to draft extra budget, Ibuki rules out bond issuance+   Harvard reclaims top spot in latest US News list   U.S. aircraft carrier George Washington leaves San Diego for Yokosuka+   Obama says he's made his choice for running mate   Main events scheduled for Saturday, Aug. 23+   Dalai Lama denies saying 140 Tibetans feared shot in western China+   Bolt all set to strike three times   Suicide bombers kill 67 at Pakistani arms factory   Former education minister Tokai appointed adviser to Fukuda+   Table Tennis champions give nod to sexing up sport   Thai Prime Minister Samak to visit Japan in early September+   Dollar trades in upper 108 yen zone in Tokyo morning deals+   Gov't set to work on extra budget for emergency stimulus package+   IOC will investigate ages of China's gymnasts