Are the stars aligning for another Al Gore moment in the presidential campaign? The former-vice-president-turned-climate-change-crusader long has hovered over the campaign despite his professed disinterest in becoming a candidate. Now, with rumors of a possible Nobel Peace Prize swirling, he's once again back in the conversation. The peace prize announcement is due on Friday, so he doesn't have long to wait to learn if he has pulled off a unique grand slam for 2007: an Oscar, an Emmy, a bestseller and a Nobel. It would vault him once again back into the center of speculation about whether he might jump...