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ITV News correspondent Romilly Weeks watched the finale of the Liberal Democrat conference with voters in the marginal constituency of Corby in Northamptonshire.
Nick Clegg joked he was glad Boris Johnson had found "one party leader he is prepared to endorse in public" after the Mayor of London gave him his "fulsome backing" in a comment piece.
During his keynote speech at the Liberal Democrat party conference in Brighton, Mr Clegg said: "As a politician you get used to receiving criticism and praise from the strangest quarters.
"But even I was taken a little by surprise by the fulsome backing I received on the comment pages of the Daily Telegraph on Monday.
"The article praised my judgement, my policies, Miriam of course. But then I saw who it was by - a certain Alexander Boris de Pfeffel Johnson.
"Well, still, at least he has found one party leader he is prepared to endorse in public."
Mr Johnson hailed the Liberal Democrat leader as a "natural Tory" in an article for the Daily Telegraph and insisted people should be grateful he "laid down his political life" to form the coalition.
He also gave 20 reasons why everybody should be grateful for Mr Clegg, declaring: "Never mind the badgers – save the Cleggster from extermination!"
Marcus Learoyd, a businessman from Corby in Northamptonshire, who watched Nick Clegg's speech with ITV News, said he "felt quite inspired" when the Deputy Prime Minister declared: "It was Labour who plunged us into austerity and it is we, the Liberal Democrats, who will get us out."
However teacher Nicola Mola disagreed, arguing that she didn't think "blaming Labour made him look good".
Denis Martin, a painter and decorator from Corby in Northamptonshire, who watched Nick Clegg's speech with ITV News, said the Deputy Prime Minister says he is "raising people out of poverty but everything else is going up".
He added: "It's about how we are going to get out of this. He says he is doing us a favour but he really is not doing anything to improve industry so wages rise."
Michelle Lynch, a care worker from Corby in Northamptonshire, who watched Nick Clegg's speech with ITV News, said it all "sounded very positive". However, she added: "I would just like him to back it up a bit and see it through. If he delivers on what he promises it's very positive."
Setting out a bleak vision of the economic challenges faced by the country, the Deputy Prime Minister finished his keynote speech by telling activists that "nothing worthwhile can be won without a battle".
Mr Clegg announced that popular former leader Paddy Ashdown is being brought back to run the general election campaign.
Latest ITV News reports
Ten things we learnt from the Deputy Prime Minister's keynote speech at the Liberal Democrat party conference.
The central theme of Nick Clegg's speech was that he and his colleagues are the moderators in a government dominated by Conservatives.