Are you kidding? Other parties are usually corrupted WAY before they receive any vote at all.
Libertarian Party: Great idea...until it was taken over by the Alex Jones/George Noory, black helicopter, UFO crowd.
Tea Party: Another great idea...until it was taken over by ultra right wing nut jobs who think Sarah Palin is the best thing since sliced bread.
Green Party: Kinda cool...until it was taken over by the anti-establishment/anti-capitalism/kill all "Big-(insertindustrialorcorperationyou dontlikehere)" commie a$$holes.
The list goes on and on.