I watched Rush's TV show. It was not carried on many stations and those that did for the most part carried it at 2 AM (in fact the only station to give him a decent time slot was WNWO in Toledo, OH). I had to use my VCR to time shift his show which was carried on WKYC in Cleveland.
I know of one radio personality that gets huge audiences, has an 'online' version of his show also available that is doing quite well. Yet when he was on TV he was a dud and didn't last long. That person is Rush Limbaugh.
Rush was not a dud on TV, he just tried TV too soon, before there were cable channels that would have carried his show. His show was in the early 90's. That was before FOX News (only CNN at the time who would not have ever considered running his show). There were only around 36 channels on cable at the time. It also was before DVR's, all there was was VCR's. His "affiliates" were OTA stations scattered in various markets (i.e. no nationwide exposure, you had to live in one of the cities that had a station that carried his show). The internet was in it's infancy at the time too.