Sure, but is rejecting the system worth losing the other battles? It's better to work within the system to change it, than to just reject it and have nothing change. Where at all possible, I do vote third party. I'm registered independent. I try and look at people's actual policy instead of just party. But throwing a temper tantrum, and just leaving isn't thr way to do it. Contact your senators and representatives (state and federal), and urge them to get rid of FPTP, put a stop to gerrymandering, and limit the effects of money in politics, all things that cement the parties' power.