Try Googling these words and notice the result:
"don brash" "keith berryman"
"rodney hide" "keith berryman"
"national party" "keith berryman"
The result: silence. Perhaps you could ask them why?
Email the good doctor at firstname.lastname@example.org
Email Rodney at email@example.com , or you could post your question to his blog.
Feel free to post any replies back here.