Lib Dem candidate Brian Paddick thanked party leader Nick Clegg for his support
The BNP's candidate for London Mayor ended up speaking to a fast emptying hall after finishing seventh and last in the poll.
Carlos Cortiglia had to speak last and was boycotted by many of the other candidates and large numbers of party workers who had listened intently to earlier speeches.
Mr Cortiglia turned round from the microphone and said: "Mr (Boris) Johnson has left. I say to him, we are democrats, we are all Londoners regardless of political affiliation."
He said he wished that there would be debates in which all candidates would have the same right to participate.
The Ukip candidate, Lawrence James Webb, also lamented that he was not allowed to take part in debates.
"I've done the best I can with one hand tied behind my back," he said.
Jenny Jones of the Greens, who came third, said: "This is a breakthrough."
Liberal Democrat candidate Brian Paddick thanked party leader Nick Clegg for his support.
"It's very easy to be a leader when things are going well, a sign of true leadership is to stand firm in the face of adversity," he said.
Independent Siobhan Benita said: "It feels really good to be on a television platform along with the other candidates. I'm so delighted with the result this evening, for an unknown independent to come this close to third and fourth places is a massive result."