When you sit down to fill in these ballots, it's usually easy enough to fill in the first few and it's easy enough to do the ones at the bottom. You know who you really don't like, so if there are 24, you might know who you want to rank 20 to 24 and who you want to rank one to four. It's the ones in the middle who are difficult.
On July 26th, 2016. See this statement in context.