The idea is popular among a lot of Democrats impatient with the Republican minority's ability to block their bills--just as it was popular with Republicans when Democrats were filibustering their judicial nominees. While the idea of a Jimmy Stewart type marathon is appealing,
this article lays out, at more length than I've ever seen, why that the majority can't actually force a minority to do it.
This article available online at:
http://www.theatlantic.com/business/archive/2009/09/forcing-a-filibuster/24771/