I don’t know what influences Limbaugh. I heard him give some discourses early on that saw very clearly what was happening with Mr. Trump and why. I think he’s in awe of the man, but I did hear a lot of people complain about his position toward him.
I believe Limbaugh came around, but I can’t vouch for his reasons.
Like Levin, I turned him off and never looked back.
They were both either absent or actively working against Trump, when conservatives need them the most. The word for that is betrayal.