Your choice is the Republican or Democrat ticket. That's it. Those are the options. You can vote for whichever party is closer to your views (or at least contains people sympathetic to it), vote for the one furthest from your views, or take your ball and go home and waste your vote on some irrelevant candidate/party. I'm sorry, but those are your choices. Your chance to really make a difference is in party primaries. Very rarely in a 2 party system will you have a candidate to genuinely be excited about voting for in a general election. For many of us, that has never happened. For most, it was only Ronald Reagan. This is the way it will always be. Get used to it.
Your discontent should be directed at the founding fathers, who, like it or not, created a 2 party system with no possibility for coalition government. That means two party's will generally hug the center to get 50%+1 votes and win. So you can call for a constitutional convention I suppose, or shake your fist to the heavens, whine and cry, whatever, who cares. There are people who sit out every election on both sides. Go to a leftie forum and you'll encounter a lot of liberals who think Obama isn't leftwing enough so they refuse to vote. Go figure. So you are one less vote to help get rid of Obama. If that makes you feel good about yourself, more power to you I suppose.
At this point, the best I can hope for is the dignity of not having co-operated with driving the nation over a cliff. Yeah, that's what's going to happen... but it will happen without me helping it along.