Levin at least is hip to this. He sees it as a brazen attempt to co-opt him and get him to shut up. Just like the time they offered Rush that spot on the sitcom with Markie Post.
Of the three Hannity is the one who appears to be under the most pressure, and hence most likely to accept.
How do they do that? Give him a cookie and threaten to take it away if he does not toe the line?