The last UK leadership election for the Labour Party [0] had a turnout of 500k+, or roughly 1% of the population. I won't bore you with the details of whether i

The last UK leadership election for the Labour Party [0] had a turnout of 500k+, or roughly 1% of the population. I won't bore you with the details of whether it's correct to think of all 500k as "dues-paying members". That's a lot less than the 30 million or 10% of population [1] who voted in the last Democratic primaries in 2016, but not "nothing like" it. And we could pick other years the turnout was much lower, e.g. 7 million [2] in 2012 where Obama did not have meaningful opposition). [0] https://en.wikipedia.org/wiki/2016_Labour_Party_leadership_election_(UK) https://en.wikipedia.org/wiki/2016_Labour_Party_leadership_e... [1] https://en.wikipedia.org/wiki/2016_Democratic_Party_presidential_primaries https://en.wikipedia.org/wiki/2016_Democratic_Party_presiden... [2] https://en.wikipedia.org/wiki/2012_Democratic_Party_presidential_primaries https://en.wikipedia.org/wiki/2012_Democratic_Party_presiden...