Rob Christensen, Staff Writer CHAPEL HILL - Democratic presidential candidate John Edwards, who toured the country last fall talking about other people's homes, is now fielding questions about his own $6 million estate outside Chapel Hill. Edwards had hit the talk show circuit to plug his book "Home: The Blueprints of Our Lives," which describes the childhood homes of various more-or-less famous people, including his own modest mill village houses. But since he announced his second run for the presidency in December, Edwards has been more likely to be asked whether there is any contradiction between his 29,000-square-foot Orange County...