Here's something interesting.
During the NDP leadership race - there were almost 130,000 card carrying membership that were able to vote. Only half of them bothered to vote - 75,000
Contrast that with the Liberals who has only 33,000 card carrying membership. Therefore you might expect only 16,000 or 20,000 Liberal card-carrying members to actually vote in the leadership process.
It really shows you how much the Liberal party has collapsed over the last 2 decades. From a strong 500,000 card carrying membership to a measly 33,000.
In fact, the liberal membership after the 2011 election was about 55,000 - they lost 22,000 card-carrying members since then.