 After that, the station switched to progressive talk as the Denver affiliate of the Air America radio network in August 2004.During its previous progressive talk format, the most popular local talk host on KKZN was David Sirota, also a newspaper columnist.In March 2009, Sirota took over the morning time slot of "The Jay Marvin Show," hosted by local talk show host Jay Marvin, when Marvin was forced off the air due to ill health.