There is:
Republicans
Democrats
Libertarians
Independents
Also there is the Green and Constitution party groups... but, heh, c'mon, let's be serious lol
Thing is both the major parties being Republican and the Democrats have lost their foundation and are all off base. There are some genuine ones still left. Very few. Some had abandoned the party altogether, Joe Lieberman, when he was attacked by his own party for his views and the fact he gets along with some Republicans, so he turned Independent to leave the party base.
Either way, politicians nowadays are only worried about the now and how to fill their pockets with more money as quick as they can in case they get voted out at some point.
Both parties are lost in greedy, power hungry limbo.
Frankly I rarely ever see a politician of today worth being President. Then again, we should focus more on congress and senate, than one position. Those two are the power groups that allow the passing or denying.