Would a new Lib Dem leader help the Tories win in 2015?

Why some Tories believe that the replacement of Clegg with Vince Cable or Tim Farron is essential to their election chances.

One of the reasons why some Conservatives believe it will be impossible for David Cameron to win a majority at the next election is the scale of the defection of Liberal Democrat supporters to Labour. If Ed Miliband's party hangs on to around a third of the Lib Dems' 2010 voters, the Tories stand to lose dozens of seats at the next election - there are 37 Conservative-Labour marginals where the third place Lib Dem vote is more than twice the margin of victory. In the 1980s, it was the formation of the Social Democratic Party and the resultant split in the centre-left vote that allowed Margaret Thatcher to win successive landslide victories. In 2015, the collapse in support for the Liberal Democrats and the reunification of the left around Labour could bring Miliband to power.

This fact has led some Conservatives to wonder aloud whether a change of Liberal Democrat leader before 2015 is now in their interests. The hope is that a more left-wing leader such as Vince Cable or Tim Farron, both of whom have signalled their availability, could prompt the party's former supporters to return home from Labour. ConservativeHome editor Tim Montgomerie recently told me that "a left-wing replacement" of Nick Clegg in 2014 was "vital to Tory hopes".

Those with an interest in a Lib Dem recovery have been encouraged by polls showing that the party would perform better with Cable as leader. A ComRes survey last September showed that support for the Lib Dems would rise to 18 per cent under Cable, compared to 14 per cent under Clegg. However, it is doubtful whether this bounce would last once Cable was forced to take responsibility for all coalition decisions (something he has skillfully avoided doing to date. Few would know, for instance, that it was Cable's department that introduced higher tuition fees) It is also the case that the party's former left-wing supporters, those who defected from Labour over Iraq and top-up fees, are likely to prove the hardest to win back.

But as we get closer to the election, this discussion will be had with increasing frequency in Lib Dem and Tory circles. If the Lib Dems are still flatlining at 10 per cent in the polls in 2014, it is hard to see the party not taking a gamble on an alternative leader. The dilemma for the Tories is whether to help shore up Clegg's position, for the sake of coalition unity, or to tacitly encourage a revolt against him.

A poll in 2012 suggested that Liberal Democrat support would increase to 18 per cent with Vince Cable as leader. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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New Digital Editor: Serena Kutchinsky

The New Statesman appoints Serena Kutchinsky as Digital Editor.

Serena Kutchinsky is to join the New Statesman as digital editor in September. She will lead the expansion of the New Statesman across a variety of digital platforms.

Serena has over a decade of experience working in digital media and is currently the digital editor of Newsweek Europe. Since she joined the title, traffic to the website has increased by almost 250 per cent. Previously, Serena was the digital editor of Prospect magazine and also the assistant digital editor of the Sunday Times - part of the team which launched the Sunday Times website and tablet editions.

Jason Cowley, New Statesman editor, said: “Serena joins us at a great time for the New Statesman, and, building on the excellent work of recent years, she has just the skills and experience we need to help lead the next stage of our expansion as a print-digital hybrid.”

Serena Kutchinsky said: “I am delighted to be joining the New Statesman team and to have the opportunity to drive forward its digital strategy. The website is already established as the home of free-thinking journalism online in the UK and I look forward to leading our expansion and growing the global readership of this historic title.

In June, the New Statesman website recorded record traffic figures when more than four million unique users read more than 27 million pages. The circulation of the weekly magazine is growing steadily and now stands at 33,400, the highest it has been since the early 1980s.