I think this article explains a lot of it, and outlines specific, common-sense ways to undo some of the damage:
"Ours is a system focused not on collective problem-solving but on a struggle for power between two private organizations. Party activists control access to the ballot through closed party primaries and conventions; partisan leaders design congressional districts. Once elected to Congress, our representatives are divided into warring camps. Partisans decide what bills to take up, what witnesses to hear, what amendments to allow.
Many Americans assume that’s just how democracy works, that this is how it’s always been, that it’s the system the Founders created. But what we have today is a far cry from what the Founders intended. George Washington and James Madison both warned of the dangers posed by political parties.
http://www.theatlantic.com/magazine/...mericans/8521/