On the eve of his big day, Fred Thompson has let another staffer go. Jim Mills, the former Fox News producer who joined the campaign only weeks ago, has resigned due to "strategic differences." This from campaign manager Bill Lacy in a memo to the staff, sent out Tuesday "just before we begin the Big Dance." "Our new Communications Director Todd Harris is building an experienced and aggressive team of campaign professionals to help lead our press operation," Lacy wrote. He added, "This constitutes a substantial shift, not in our candidate's message, but in the way we support it and...