If you make more than $111,000 a year, you want to vote for McCain. He'll give you bigger tax breaks. Everyone else (over 60% of taxpayers) should vote for Obama, who will give people who make LESS than $111,000 a year bigger tax breaks.
Republicans only benefit the already rich. They want to preserve their power and money. Democrats try to make the world a better place for everyone.
However, as it was said in 1776: "But don't forget that most men without property would rather protect the possibility of becoming rich, than face the reality of being poor." People will still vote Republican, even when it's clearly against their best interests.