See here. A snippet:

Liberalism’s new and impressive network of organizations — especially fund-raising, grassroots mobilization, and communications — has left in the dust anything conservatives have ever put together. Organizations like America Votes and ACORN are so closely tied to Democrat politics that they might as well be arms of the party apparatus. The George Soros-funded Shadow Party of organizations run by former Clinton administration officials and liberal leaders — the Center for American Progress, the Thunder Road Group, MoveOn.org, Media Matters, etc. — has created a second left-leaning party free from restrictions imposed by official regulations — including McCain-Feingold.