Why have political parties become so polarized that they fail to address the concerns of most Americans?

As the presidential campaigns raise more and more money, and Washington has trouble finding agreement on much of anything, I'm joining Unity08.com – a diverse group of Americans who believe that neither of today’s parties reflects the aspirations, concerns or will of the majority of Americans.
Update: Yahoo! Answers Staff Note: Yahoo! Answers is a forum for people from all over the world to engage with one another and to find information on topics that interest them. This is not an endorsement. We are not siding with any candidate or party -- in general or for the 2008 US elections. We’re hopeful that people... show more Yahoo! Answers Staff Note: Yahoo! Answers is a forum for people from all over the world to engage with one another and to find information on topics that interest them. This is not an endorsement. We are not siding with any candidate or party -- in general or for the 2008 US elections. We’re hopeful that people from all perspectives will realize the great insights that the Answers community can have, and will turn to us for future discussions.
Update 2: Yahoo! Answers Staff Note: Watch a video of Sam Waterston discussing his political views: http://video.yahoo.com/video/play?vid=476106
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