the Republican and Democratic Parties." - George Wallace
Wallace made that statement at a time when he was seeking the presidency through a third party. Ironically, four years later (1972), he was winning states in the Democratic primaries. Had he not been shot, he would have been the Democratic nominee in 1972 and it's possible he would have beaten Nixon.
So, why did he abandon his third party and return to the Democratic Party? Because just like Ron Paul, he realized you can't beat the two-party system. It doesn't matter if you're a billionaire, Teddy Roosevelt, or a regional revolutionary like Wallace. The ONLY way to effect change in this country is THROUGH the two party system. Try to go around it and you fail. That's the way it's always been. That's the way it always will be.