Corruption is the inevitable result of a powerful and intrusive government. The more powerful and more intrusive the greater the corruption there will be. Money isn't the cause of the corruption, it's the means to achieve it. Take away the money and a different way to accomplish the corruption desired will be found.
You ask how the Citizen's United decision helps all of this? Doubt it will frankly. But, as some like to say, it evens the playing field.