David Axelrod said this quote

If your party serves the powerful and well-funded interests, and there's no limit to what you can spend, you have a permanent, structural advantage. We're averaging fifty-dollar checks in our campaign, and trying to ward off these seven- or eight-figure checks on the other side. That disparity is pretty striking, and so are the implications. In many ways, we're back in the Gilded Age. We have robber barons buying the government.