No doubt. It's Soros again. Details at Classical Values. The money quote from 2004:
In a December 9th e-mail signed by "Eli Pariser, Justin Ruben, and the whole MoveOn PAC team," the Soros front group stated: "In the last year, grassroots contributors like us gave more than $300 million to the Kerry campaign and the DNC, and proved that the Party doesn't need corporate cash to be competitive. Now it's our Party: we bought it, we own it, and we're going to take it back."