Yes, Moveon has an amazing number of people who have joined in activism, over two million members in the US and growing fast.

from a recent MoveON email:
".... on Friday, we finished our $10
million Voter Fund grassroots fundraising campaign without a dime from corporations or special interests. In the end,
over 170,000 people opened their checkbooks and contributed an average of about $60 to put ads on the air that
challenge Bush and his corporate backers. The impact of this campaign shouldn't be underestimated: it clearly
demonstrates that real people still matter in American politics. And the folks in Washington know it."