Two's In - I can sort of relate - our political system is basically a two horse race with daylight third. Our versions are The Liberal party (our version of the Republicans) that would probably be on a policy basis in recent times similar to your Dems, and the Labor party similar also to a slightly further to the left dems. The traditional divide of the Libs being close to the Tea party and the Labor party being basically an arm of the trade unions is long gone.
Our pollies and parties lack only a few small things such as vision, leadership an understanding of the average voter and standards. All told, it's pretty difficult to respect any of 'em. Which is why our prime minister isn't addressed in deferential tones, rather when members of the public meet her its usually on a first name basis. We do not fawn over our leaders, they put their pants on one leg at a time just like the rest of us.
If you gave an option to an Aussie to vote for:
A. Liberal candidate
B. Labor candidate
or...
C. Tying both of the pollies to a pole because they are all thieving lying bar stewards, setting fire to both of them and going for a good p1ss up, I guarantee most Aussies will take option C.