Well, one thing about America is that it is not a true democracy. Athens was a true democracy (except for the whole slavery and women's rights) but America is a representative democracy. We're voting for someone who's going to vote for someone who hopefully votes for what we want. This is because a true democracy would be almost impossible for a large country like the USA. What this leads to is essentially an aristocracy. You'll notice almost all politicians are rich and connected people. This is because they have the money to advertise themselves, and they don't need to work for a living. You cannot hold a job and run for office at the same time, politics is a full-time commitment. That's why the first term for a candidate is usually the hardest, the money issue, and the issue of familiarity. People go with what they know, even if it could be a worse choice. And not just familiarity with the candidate, but the candidates experience with politics. You'll find some people arguing for one candidate simply because they have had more experience with government.
That's why you see more white, rich men in office. Rich, old, white men who are paid well, by the government.
Note: Though sometime poorly represented, we did vote for people on platforms, and we kept or took them out of office depending on if they stayed true. We are to blame for these, really. And you'll find that people want safety more than liberty. That is why we have free speech, with rules like yelling fire in a theater, and advocating terrorists.
Anyway, that's how I see American politics, but the whole thing is a big mess. I don't really know any two people who can agree about politics.