07/27/2010 05:08 pm ET Updated May 25, 2011

Ezra Klein: How To End The Filibuster With 51 Votes

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, there's another path open to the Senate's growing ranks of reformers: The so-called "constitutional option," which is being pushed particularly hard by Sen. Tom Udall, but is increasingly being seen as a viable path forward by his colleagues.

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