It's not about drugs. Drugs are just one of the things he's least principled about, so it was easy to find a quote from him about them. If I could find statements (which I'm sure I could if I looked hard enough, and if not I'll just have to wait a few weeks) saying that he supports the War in Iraq, deporting illegal immigrants, national ID cards, etc., I would have quoted him on that too.
All of these things are absolutely, positively, 100% cut-and-dried libertarian issues. You cannot support them and be a libertarian. End of story.
I'd be willing to accept people into the LP who aren't yet fully convinced on these issues, but Babar isn't just a LP member anymore. He's the person who essentially represents libertarianism to the unwashed masses. There is no fucking excuse for supporting the Drug War.