The plot thickens, as seen in Glenn's latest update:
There was some significant, and apparently unexpected, obstructionism on the part of Republicans this afternoon, whereby they blocked votes on any of the pending amendments and then filed a Motion for Cloture (i.e., to force a vote on the Senate Intelligence Committee bill as is), the vote on which will occur on Monday at 4:30 p.m. Supposedly, the obstructionism angered Reid and other Democrats and now Reid will not only support Dodd's filibuster but urge his caucus to do so as well.
I'm still trying to understand exactly what occurred procedurally and what the implications are, but for now, both Marcy Wheeler and McJoan have good explanations. The essence is that 36 Democrats already voted against the SIC bill (and in favor of the Judiciary Committee bill). To sustain a filibuster, they need 41 Senators who refuse to vote for cloture -- meaning they would need to convert 3 Democrats who voted for the SIC bill, plus Obama and Clinton (who are scheduled to be in DC on Monday for the State of the Union address). This is where Obama and Clinton's leadership could really make a genuine difference. More on this later.