There are differences between candidates within each party. And historically both parties have gone through drastic changes. You can vote for like minded candidates at the local level, the state level, and as they gain experience they’ll be better suited to succeed nationally and change the party as a result. But this requires you to actually vote. In every election. Always. And I get the sense that those who complain it’s a two party system the loudest are just offering an excuse as to why they simply don’t vote, don’t participate in our democracy. The people who run for national office in say, the Green Party, rarely have any government experience or real leadership experience. It’s just boilerplate slogans and a clear demonstration they don’t really know what’s going on. Why the fuck would I vote for that? Shit, I can say all the right things and run for President. But I would suck as president because the job is much more bureaucratic management than just saying shit out loud.