As if the leadership will allow that.
We couldn't even knock out Specter without the powers that be getting involved and stopping us.
IIRC, that was due to Rove's machinations on behalf of W's re-election, W's sense of loyalty to Specter, and the re-registration of union members solely to interfere in the pubbie primary. That was quite a convergence, and it's no reason to give up in dispair. The last enduring, successful third party resulted from a momentous issue about 150 years ago.
How did specter vote.
This issue is now owned by the Republicans.
A few more R's and the Rino's can't hide behind procedures.