It's not a case of right or left leaning bias here - Glenn Beck pushes conspiracy theories and things that just aren't true. There's a difference between political leanings and full on crackpot journalism.
Congratulations to you for avoiding the Glen Beck hysteria, but if you have to ask for Glen Beck examples of him pushing conspiracy theories, you’re really out of the loop.
This guy used to sit on Fox News prime time and draw elaborate web of connections on a chalkboard. On national network television. He lost advertisers for the stuff he was doing, and his program was jet fuel for the Tea Party movement (which became the modern alt right).
Feel free to Youtube Glen Beck on Fox News, hopefully none of it is censored because it’s a real trip if it’s the first time you’re watching it.