How big are the right-roots? And how do they stack up against the net-roots? I've been asking that question of various people lately, and also looking at some of the metrics available, as both sides of the American political spectrum continue to grow and flex their online muscles in this turbulent season. Here's some relevant data regarding their respective online donor bases.

MoveOn.org, the five-million member e-organization of progressive activists, is doing something really interesting with its members tonight: thousands of them are going to be participating in a live online dial-test of President Obama's State of the Union speech. The organization sent out an email earlier this evening to its list, asking people if they want to rate the speech live.

The international e-organization Avaaz, which was founded three years ago and describes itself as a "new global web movement with a simple democratic mission: to close the gap between the world we have, and the world most people everywhere want," is undergoing explosive growth around the Copenhagen climate change summit. Its e-petition campaign for a "Real Deal Now" is up to 13.7 million signers; that's a jump of 2.7 million since a week ago when activists staged a sit-in and started reading names of petition signers in an effort to dramatize their cause. [SEE CORRECTION BELOW.]

A new online video released yesterday by liberal online behemoth MoveOn.org has hit a nerve. Starring comedian Will Ferrell and a host of A-list Hollywood actors, the video has already been 1.5 million times in less than 24 hours. Ilyse Hogue, the group's director of political advocacy and communication, tells me that it is "by far our best performing [video] through social networks." She reports that nearly 250,000 of those views have come from people clicking through links that supporters of MoveOn have placed on their Facebook pages, and another 36,000 or so from Twitter referrers. Not bad. [More analysis after the jump.]

There's something interesting going on over on Senator Arlen Specter's Facebook wall. Hundreds of people--many, if not all of them, constituents of the Pennsylvania Democrat (who was not long ago a Republican)--are posting short messages urging him to defend the Clean Air Act, which has been weakened in the House version of President Obama's pending climate legislation. Same with Senator Dianne Feinstein's and Facebook walls. A kind of digital picket line has formed, with a steady beat of posts appearing from the Senator's fans online.

I guess it's MoveOn day here at techPres. The giant e-group has just reached into its 2004 playbook and announced an "Obama in 30 Seconds" contest for video makers. The reason? "The race isn't over, and we've got to pull out all the stops to help him across the finish line," the group says.

MoveOn is rolling out some cool new tools for political organizing, starting with "VotePoke"--an innovative way to get people registered to vote--and ActivList, an event syndication feed.