CNN — When New Zealand’s populist Deputy Prime Minister Winston Peters strode out to address a political convention in the city of Palmerston North in March, the sound of British punk band Chumbawamba’s iconic song “Tubthumping (I Get Knocked Down)” blared over the speakers. And while this wasn’t the first time Peters had used or referenced the ‘90s hit, his choice of song has now attracted the vocal displeasure of the band itself. During his State of the Nation speech, Peters, the leader of the nationalist New Zealand First party, criticized the former Labour government’s policy of co-governance (joint decision-making...