As for what I have heard from a couple of very liberal people I know is best wishes for recovery when this very subject came up, and were pointedly opposed to legal harm coming to him over this.
Thinking about it, it makes sense to apply the medical problem model even handly if indeed one believes drug problems are medical in nature and recovery is more logical then to seek stronger and stronger retribution for use and sale to remedy the situation involved with drug use. Sometimes liberals try to remain consistent in this way.
I bet that anyone who posed it to someone who was gleeful at the woes of a fellow human being with a medical problem, I bet they would quickly agree that they need to lighten up on Rush.
Many feel like Rush is a part of their family, and nothing really has changed. Hype or no hype, nobody ever seriously thought Rush was not a fallible human being anyway you look at it. Life goes on.