Day two of the Democratic National Convention crawled to its end late Tuesday night, meeting the halfway mark of the four-day political telethon with a speech in an empty school from former second lady Dr. Jill Biden.The evening started slowly, with activists and politicians giving halting speeches in empty rooms of their own, gaining speed at the bottom of the hour with Bill Clinton before squandering the near-energy he generated on a long nomination and school library balloon party.The DNC worked against itself throughout the two and a half hour digitized convention, drowning the few small chances for enthusiasm...