Lessig's point is a fair one. And it's not about banning lobbying.
The problem is the same - money in congress is distorting its policies, agendas and outcomes.
But Lessig's solution is to make the money = the people's voice. He recognizes that money will flow, and is in fact part of the process. But the idea is that you structure the system such that the candidates want to get monies from their constituents more than they want it from the big businesses.
He proposes one way to realign these interests is to publicly fund elections - in some way or another.