From what I understand, there are several problems; first, there's the traditional "my vote doesn't matter, cause it's only one vote out of so many." This is false in itself; what are the final tallies but a vast collection of single votes? Secondly, there's the people who believe (stupidly)that they can send some kind of political statement by not voting. This is absurd, mainly because that's the only way the common man legitimately has a voice in U.S. politics; by voting for people they believe most embody their interests. That's a chunk, though not all reasons; some people are just lazy and don't care. The bottom line, however, is vote. That's the best way to ensure your voice is heard, and that's how we keep our own reigns on the government.