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Nick Clegg is celebrating after what he described as a "stunning" by-election victory in Eastleigh, where his former Cabinet colleague Chris Huhne resigned in disgrace.
But there was a setback for his coalition partner David Cameron with the Tories forced into third place by UKIP.
Political correspondent Carl Dinnen reports:
UKIP leader Nigel Farage has told a press conference that "never again" will people say voting for the party is a wasted vote, following the Eastleigh by-election where the party finished second.
He added that he intended to capitalise on the "tremor" UKIP had created in Eastleigh and turn it into a "national political earthquake" at the European elections next year.
The Labour backbencher Austin Mitchell has described Labour finishing fourth in the Eastleigh by-election "a disaster":
The Conservative MP Conor Burns appears to blame local councillors rather than the central party leadership for the party's poor performance in the Eastleigh by-election:
Speaking after the Eastleigh by election result in which they came third, Prime Minister David Cameron has said the result was "disappointing".
He added that the Conservatives would win back voters by "remaining true to our principles".
The Labour party candidate John O'Farrell has tweeted on the morning after his defeat in the Eastleigh by election.
Nick Clegg told Liberal Democrat supporters they had won a "stunning victory" in Eastleigh, despite the "exceptional circumstances".
Latest ITV News reports
The Conservative Party has a habit of turning a drama into a crisis. Especially when the background to the drama is Europe.
The wider political impact of parliamentary by-elections often turns out to be more important than the result – Eastleigh is no exception.