Sanders opposes and has opposed Citzens United, Corporate Financing of Election, the TPP, and the Iraq war since the beginning. He has never accepted corporate money in his entire career and isn't now that he's running for president.
AFAIK he is the only candidate with a long political record who's speeches are in line with his actions. You could vote for him or, you know, talk about the cynacism of the two party system and how political change is impossible.
I do know one thing. Cynacism is obedience to the plutocracy. Sure, it talks differently, but it functions exactly the same way.