You know you’re over the target when you’re getting flak.
The left is afraid of Levin in a way that they’re not afraid of any other radio host other than Rush. They’ve just woken up to Levin, and they’re afraid of him because he always speaks the truth, is well informed on the issues, and most of all, because he has a loyal audience.
And because they know he is very smart.
None of them want to take him on because they are afraid to be shown up by him.