Where in the world is Hillary Clinton? The Tribune's Rick Pearson, on take-off from Texas in the Clinton campaign plane, noted one missing passenger: The candidate. Rick's file below leaves a lot of questions unanswered, he readily admits. Follow us, on and off this evening, while we live-blog, in search of the answer to the question, where in the world is Hillary Clinton? * * * * DALLAS — When reporters arrived at Hillary Clinton’s campaign plane this evening, someone was missing — the candidate. Officials for the campaign refused to say where Clinton was or why she was not...