They signed up 500,000 supporters with an Internet petition -- but Bill Clinton still got impeached. They organized 6,000 candlelight vigils worldwide -- but the U.S. still invaded Iraq. They raised $60 million from 500,000 donors to air countless ads and get out the vote in the battle-ground states -- but George Bush still whupped John Kerry. A gambler with a string of bets this bad might call it a night. But MoveOn.org just keeps doubling down.

Now that Howard Dean has been named chair of the Democratic National Committee -- an ascension that MoveOn helped to engineer -- the Internet activist group is placing another high-stakes wager. It's betting that its 3 million grass-roots revolutionaries can seize the reins of the party and establish the group as a lasting political force. "It's our Party," MoveOn's twenty-four-year-old executive director, Eli Pariser, declared in an e-mail. "We bought it, we own it and we're going to take it back."

The ad, which depicts senior citizens performing manual labor, was not only paid for by MoveOn members but was also created by them. This kind of closed feedback loop is indicative of a larger problem: the group's almost hermetic left-wing insularity. "We don't get around much," acknowledges Boyd. "We tend to all stay in front of our keyboards and do the work."