Its unfortunate that some people feel that a vote for someone other than the dominant party stiffs is worthless.
Some people also feel that voting at all is a waste of time.
This leaves enormmous potential for someone other that the republicrat stiff to be elected. The only way to enact change in this country is to vote for someone outside of the status quo. For those that say there really is a difference between the two dominant parties, I think you honestly need to look at the big picture. America is the most conservative democracy in the world, and all the fighting between the two dominant is over a very narrow portion of the center-right. The only people that really see a big difference are the party zealots.