Guest PostThe Daily Show's limits By Chris Beneke and Randall Stephens May 10, 2011ShareShare on TwitterShare on FacebookEmail to a friendPrint "Open conversation that leads to nothing." That's how Jon Stewart summed up his interview with popular right-wing historian David Barton. He was right. After 30 minutes of glib back-and-forth with Barton (ten of which made it onto TV), Stewart was flummoxed, worn down, unfunny: