I like to believe I know enough about politics to be able to vote based on my own beliefs. But "beliefs" are a big part of political preference in a two-party system, and I believe I might have narrowed them down...
Liberals: believe life is important Conservatives: believe their life is important
A lot of people might see this viewpoint as skewed one way or another, but think of it:
Liberals are generally pro-environment, pro-world, and sorta anti-human in the same sense. Liberals don't necessarily look out for what is best for their nation in their quest to make things more secure and advanced without first seeing how it will affect the environment and other nations.
Conservatives tend to strive toward things that will make them safer and more advanced, without caring too much about the safety of other nations or the environment. This often strengthens themselves and leaves others out, but no matter how inhumane that might sound, the attitude often has more benefits than it has drawbacks.
Of course, these are all just thoughts of mine. I'm generalizing a whole freaking lot - there are several exceptions on each side.
But just for a second, I'll stop trying to be fair and balanced (regardless of how poorly I'm doing), and give a little peek into my own political beliefs: