Mott the Hoople
Sweet Jane
But that's my point. The British system is a proportional system so it's not a valid comparison. Look at the political influence that Libertarians, The Reform Party, The Green Party, etc have had in our system? None!The Liberals in Britain have existed for more than 80 years without managing to replace either party. So you can obviously exist in limbo if you're entrenched long enough. Survival in a winner take all system really depends a lot more on how entrenched you can make yourself - sure, the LD's in Britian don't win as many seats as there votes would suggest, but a brand new party polling 20% of the vote in America or Britian probably wouldn't gain ANY.