The right likes to say, Oh yeah, what about George Soros? whenever the left decries money in politics and particularly the Koch brothers money.
The difference is simple: The Kochs buy politicians and policy that further enrich them, while Soros supports policies that support all Americans and actually cost him.
As for unions, they have democratically elected leaders (not autonomous CEOs) representing many peoples interests. That said, theyre still outspent by corporations 15 to 1.