It's mildly entertaining, but unlikely to do anything -- unless they go for long enough. Sanders was visibly exhausted after talking for nearly two hours, and it's unclear whether other Democratic Senators will take the mantle after Landrieu is up.
Via NPR, Sanders explains his moves:
You can call what I am doing today whatever you want, you it call it a filibuster, you can call it a very long speech. I'm not here to set any great records or to make a spectacle. I am simply here today to take as long as I can to explain to the American people the fact that we have got to do a lot better than this agreement provides.