Sometimes I don't even know where to start with you and your complete ignorance of everything that is American.
1. 300 million people in this country do not vote. More like 80-110 million
VOTERS.
2. People who aren't rich can affect politics. Case and point Obama, VP. Biden, Sarah Palin, Cindy Sheehan, McCain. Most of these people weren't rich when they started out and to this day they aren't remotely rich by whatever standards it is you think 'rich' is. I'd wager anything it just means somebody who works and gets paid for more then 40 hours a week of work.
3. The definition of democracy :
democracy - Definition from the Merriam-Webster Online Dictionary
The United States is a Representative Republic. Meaning the people elect their representatives. Why do I bring this up?
Well in every state we have :
1. Representatives. These people are elected by a minute percentage of the U.S. ie. the people who live in the corresponding district.
2. Governors. Once again elected but this time by the entire state to preserve the idea that every single state is a sovereign state.
3. Senators. Once again elected by the people of their corresponding states.
4. POTUS : The CinC/Head Executive of the entire United States eligible voting population.
So what have we established?
1. You do not know the definition of a 'democracy'.
2. You do not know how a democracy works i.e. ONE person, ONE vote.
3. You do not know how the United States government works.
4. You do not know who does and doesn't vote in the United States.
5. Your premise that people who aren't rich can not have an effect on politics.