One who does not commit him/herself all the way to one side of the political fence. One who actually reasons things out for themselves instead of hopping on the bandwagon and listening to what everybody else says.
Guy 1: Are you a republican or a democrat?
Guy 2: Neither, I'm an independent.
Guy 1: So you're just too indecisive to take a side.
Guy 2: No, I just have my own opinions on politics. I don't vote for a person just because of their political party; I actually learn about the candidates and vote for who I think would best benefit the country as a whole.
Guy 1: Oh.