Money will impossible to get out of politics as long as the government has massive power to regulate the economy. As long as congress can give subsidies and contracts to favored industries and firms (necessarily at the expense of less favored firms and industries, who have to compete in the market) and also increase taxes and regulations on disfavored industries (finance, oil), then businesses would be insane to not spend as much money as they need to paying off senators to make sure they don't get screwed.

Everyone who votes for politicians that promise to increase Washington's power needs to realize that they're also voting to increase the influence of money in politics.