Ryan,
If these posts are affecting your work, it might be a good idea for you to change your email delivery preferences for this group to "digest", or "no emails". This will not prevent you from receiving emails for posts you make to this group, and will cut down on how much spam ends up in your inbox.
Mike already has enough responsibilities and moderating spam would take away from those. If you believe the spam has been bad enough to warrant investigating solutions, I would recommend doing some investigation into what solutions would be helpful.
Allen