Evidence shows that John Key can increase turnout in local body elections.
In the 2010 NZ local elections, John Key made a personal appeal for people to vote. Almost half the electorate did.
In the 2013 NZ local elections, John Key did not get similarly involved. The result was a fall in turnout to 43%.
Maybe the answer to future turnout is John Key’s personal intervention?
It’s about as evidence-based as the bollocks spouted by those claiming that turnout will be better if we have new voting formats, media coverage, more information, civics lessons etc.