Being a liberal means never having to say you're sorry [Updated with a note from Ezra]

Back in 2005, when the GOP kept getting frustrated by Democrat filibusters, the GOP came up with what they called the "constitutional option" to end the filibuster. Democrats and the media referred to it as the "nuclear option."

Well, fast forward to today and lefty Ezra Klein is all in favor of the constitutional option.*

If you can't manage the 60 votes to overcome a filibuster, you can't manage the 67 votes to change the rules and end the filibuster. At least in theory.

But in practice...