b, austin. c, memphis. d, charlotte. you know your answer could provoke an argument or two with barbecue enthusiasts but no one would attack you unless you re michelle obama. the first lady seen here with her husband visiting an asheville, north carolina, barbecue place last year sent out an e-mail this week about the 2012 democratic convention coming to charlotte. she wrote, vibrant, diverse and full of opportunity. the queen city is home to innovative hard working folks with big hearts and open minds and of course great barbecue. those two words describing charlotte, great barbecue, were enough to set off a week of grilling of mrs. obama starting with charlotte observer editorial says to get the best stuff you have to drive north to lexington. that s only an hour away. for anyone who lives in los angeles or montana, an hour away