1 - A 'news' reporter fronting a program on New Zealand's TV3 station dealing with current affairs called 'Campbell Live'.
His reporting style is generally sensationalist and severely biased towards the perceived underdog. He commonly promotes public outrage by feeding the ignorant masses false or exaggerated claims based on pseudoscience. He also supports any minority group he can find, despite the fact that he is the epitome of an upper-middle class metro white guy. This, among other things, makes him a Fag Enabler
2 - to "do a John Campbell" is to get stuck repeating words like "but" in an annoying squeaky, whingey tone when someone is saying something you don't agree with, especially when the statement you disagree with has something to do with minorities. Named after the aforementioned NZ reporter.