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Labour and the Conservatives are both becoming more ideological, Liberal Democrat Danny Alexander has said.
Speaking on ITV's The Agenda, the Chief Secretary to the Treasury said: "Labour is becoming more, kind of, left-wing, the Tories are becoming more anti-European.
"And I think both of those things mean you can't have the Tories or Labour by themselves anymore."
On suggestions he had "gone native" at the Treasury, Mr Alexander said that on the contrary, "the Treasury has been captured by the Liberal Democrats... George Osborne's the hostage".
Labour leader Ed Miliband said he was not considering a coalition with the Liberal Democrats and was working for a majority government.
He told ITV's Daybreak: "I'm clear I'm working for a majority Labour government. I'm not interested in backroom deals. I'm interested in how do we work for a majority Labour government, how do we change this country, and that is where 100% of my focus and the focus of my party is."
The animosity between Ed Balls and Nick Clegg had previously been regarded as a major obstacle to the two parties joining up if there is a hung parliament after a general election.
Asked about Labour on the programme Mr Clegg said that if such a pact was formed, the Lib Dems would set out to restrain Labour from spending too much.
Nick Clegg has fuelled speculation that he is positioning for coalition with Labour next year by saying he believes Ed Miliband's party has "changed".
The Deputy Prime Minister also criticised the Tories for lurching to the right, accusing his current partners in government of becoming "much more ideological" since 2010.
The comments, in a BBC Radio 4 documentary, follow an apparent thaw in relations with shadow chancellor Ed Balls.