The Puppetmaster of the Left...

The man who controls the cash flow controls the extremist liberal left.
Some, ahem, money quotes:

Soros has been neck-deep in Democrat intrigue since at least 1994. Three weeks after Republicans swept Congress in the mid-term elections that year, Soros dtated in a November 30, 1994 speech that he wished to "do something about… the distortion of our electoral process by the excessive use of TV advertising." [2] Evidently, Soros realized that the most efficient way to control political advertising would be to control the flow of "soft money" earmarked for the political parties. Within eight months of Soros’ speech, Democrat Senator Russ Feingold obligingly rose on the Senate floor to denounce soft money abuses, thus setting in motion the political steamroller that would ultimately flatten all opposition and give us the McCain-Feingold Act of March 27, 2002.

Few Americans realize that it was George Soros who bankrolled the seven-year lobbying effort without which McCain-Feingold never would have seen the light of day. As a Wall Street Journal editorial noted, "Combine… the $1.7 million that Mr. Soros gave the Center for Public Integrity, the $1.3 million he gave Public Campaign, the $300,000 to Democracy 21, the $625,000 to Common Cause, and the $275,000 to Public Citizen – and you can be forgiven for believing Mr.
Soros got campaign finance passed all by himself."
...
By pushing McCain-Feingold through Congress, Soros cut off the Democrats’ soft-money supply. By forming the Shadow Party, Soros offered the Democrats an alternate money spigot – one which he personally controlled. As a result the Democrats are heavily – perhaps even irretrievably – dependent on Soros. It seems reasonable to consider the possibility that McCain-Feingold, from its very inception, was a Soros power play to gain control of the Democratic Party.
...
Jonathan [son of George Soros] Soros is a MoveOn.org activist, a financial sponsor of MoveOn, and a contributor to other Shadow Party groups as well. His brother Robert is focusing, for the time being, on state-level politics. Robert and his wife Melissa gave $100,000 to the New York State Democratic Campaign Committee in 2004.