How old are you? 5?
"corporations have far too much power in our political system" Corporations like GE who backed Obama? Solindra? Obviously not the Labor Unions which collect money from their workers and give it to politicians for political favors? No, not the labor unions like United Auto Workers that Obama gave GM to (they own 51%, known as controlling interest).
Wall Street banks crashed our economy? Who's butt did you have your head up from 2005 - 2009? The crash was due to excessive mortgage loan defaults. In other words it was caused by people taking out loans that they could not pay back. Yes, the evil banks gave money to families that couldn't pay them back. They did it because the Community Reinvestment Act.