His start was before he was on CNN...
here is a link to the article Bill D referenced above.
Glenn Beck

".......Beck finally got his big break in 1999. That was the year Clear Channel bought Tampa's WFLA, home to the popular liberal talk legend Bob Lassiter. Lassiter was squeezed out within a year of the sale and replaced by Beck, who jerked Tampa talk radio to the right. He is remembered by locals during this time for his skits depicting Satan writing love poems to Hillary Rodham Clinton, and for dangerously stoking anti-Democrat sentiment in Florida during the tense 2000 election recount........"