Melodeon, you can learn a bit more about Nader here:

brief history at www.nader.org

He's not really a politician at all, and he's not running to win the presidency. Briefly, he's running to consolidate the Green Party in the US and secure federal campaign funds for the party in the 2004 presidential election.

Just curious: why would you be "horrified to see another Bush in the White House"? I know the stock answer in the US, I'm curious what the British take on this is.