... you might ask what legislative body would be daft enough to do something like that based on seats, but the vote to squash a filibuster in the US Senate is not 60% of Senators voting but 60% of Senators in the body.

So its the US Senate that is daft enough to do that.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.