It's not a third party that needed, but...
http://nota.org/
"If 'None of the Above; For a New Election' receives the most votes, no candidate is elected to that office and a follow-up by-election, with new candidates, is held. Note that even candidates running unopposed must obtain voter consent to be elected."
...and...
...no-party politics...
http://en.wikipedia.org/wiki/Non-partisan_democracy