Not only have Tourism NT approved and are bidding on a racially offensive keyword, they are actually including the word 'abo' in an advertisement. It appears thanks to Google's dynamic keyword insertion.
screen shot from http://www.google.com.au/search?q=abo (May 10th)
My initial reaction is to blame it on incompetence. Sure, Aboriginal culture represents massive opportunity for Tourism NT and it's clearly a focus for them but I still think this is inexcusable.