It is absurd to me that there can be enough constituents out there that give enough support to these crazy people, that they are potential candidates for any public office, let alone the office of president of the united states.
I understand the fact that in any population there will be elements that gravitate towards certain extreme positions, but seriously, is the proportion of people who support such an positions large enough to maintain a presidential candidate? That to me points to something being imbalanced about the society that it produces such strong support for a fringe candidate. (Yes, I place Ron Paul - who I agree with on a lot of issues and would support were I an American - in this fringe category too)