The fate of Obamacare now rests with the Senate, and it will pivot on Harry Reid's ability to overcome one measure in particular: the filibuster. It wasn't always so easy to block legislation using this tactic, since senators no longer have to remain on the floor and read out loud until their wills--or their bladders--give out. Click through this TNR slideshow to see some of the most memorable filibusters in congressional history.