The difference between Obama and Romney is the difference between the Republican Party as a whole and the Democratic Party as a whole. Democrats worship government and pretend to care about the little guy while lining the pockets of the big guys, Republicans pretend to worship the free market and conservative ideals, while using the very liberal approach of using government as a hammer to produce changes, rather than truly getting government out of the way or at least empower the states rather than consolidating power in the federal government.
On the surface, Obama and Romney are very different and have very different visions for America. When you get down to the nuts and bolts, the only differences between them are some social issues (like gay marriage) and whether we're letting corporations or unions and government screw the taxpayer.
Spread the word to your friends and family - If you're sick of the politicians you're getting, and you wish someone would pay attention to what the people want rather than what the rich and powerful want... USE YOUR VOTE. Voting for the lesser of two evils just tells both parties that they can get your vote if they suck just slightly less than the other guy.