Geez...if that's your assessment of Levin fine...but try reading his book then try Becks. You might change your opinion. The main difference between the two is one is a Libertarian, and the other is conservative. Both guys help the cause.
No, the main difference is that Beck is having an effect as is evidenced by the unrelenting attacks on him from the left. Levin? The left could care less about him.