Credit where it's due, the pun was originally Victor Lewis Smith's. I tended to use Bleuch or Blur or Blurgh, but I thought given the circumstances....

As for the immunity thang, I'll have to trawl through so much stuff to find it....but I recall a politicartoons page dedicated to it some year or two ago. Wasn't just GWB that was immunised in the bill, I seem to remember Cheney et al were included too.