Some more surfing uncovers some possible concerns by WF that ML may have been involved in (or the victim of) some nasty dealings above and beyond just harassment: WF may be just as gun-shy as it seems vindictive.
Also, kudos to whskyjack for mentioning OpenSecrets (http://www.opensecrets.org/). I can’t emphasize how valuable OS is; it’s always a good source for cogent, considered and reliable information.