WHY WON'T FOLKSY "Law & Order" actor Fred Thompson just admit he's running for president of these here United States? It all boils down to that pesky NBC show, and using that exposure to your best advantage. Thompson, a Republican, has dabbled in acting, lobbying and lawyering over the years, serving as Tennessee's representative in the United States Senate from 1994 to 2003. In his twilight days of serving the country, he joined the cast of "Law & Order" in 2002 as good'ol backwoods boy and New York City District Attorney Arthur Branch. Strong character, basically a good guy who...