NASHVILLE — Republican congressional hopeful Robin Smith says that, when she was state GOP chairman last year, then-Democratic presidential candidate Barack Obama labeled her as “everything from racist to terrorist to extremist” after the state party posted a video criticizing Michelle Obama. Mrs. Smith, who is running in the 3rd Congressional District primary, made the assertion in a recently videotaped interview with Helen Smith, a commentator for the conservative Internet Web site Pajamas TV. Dr. Smith, no relation to the candidate, asked why more women do not run for office. “From personal experience I can tell you ... I was...