Lord Ashcroft's marginals poll gives Labour and the Lib Dems reasons to be cheerful

Labour has a 14-point lead in the 32 most marginal Tory-Labour seats, while the Lib Dems are just three points behind the Conservatives in the eight most competitive Tory-Lib Dem seats.

After the return of economic growth and the narrowing of Labour's poll lead prompted some Tories to talk of a "glide path to victory", Lord Ashcroft's marginals poll has provided a much-needed dose of realism. The survey of the Conservatives' 40 most vulnerable constituencies shows that the defection of Tory supporters to UKIP means that Labour now enjoys a 14-point lead in the 32 seats where it is in second place, compared to a national lead of just five in Ashcroft's poll. In short, the party is gaining support where it matters most. Labour is on 43% (down one since 2011), the Tories are on 29% (down six), UKIP is on 11% and the Lib Dems are on 8%. That lead is large enough for Miliband's party to win the 32 most competitive Con-Lab marginals and a further 66 off the Tories if the swing is replicated elsewhere, putting it on course for a comfortable majority.

But it isn't just Labour and UKIP that have cause to be cheerful; there's also some rare good news for the Lib Dems. In the eight most marginal Con-Lib Dem seats, Nick Clegg's party is just three points behind David Cameron's, with a swing of only 0.5% to the Tories since 2010. The Conservatives are on 32%, with the Lib Dems on 29%, Labour on 18% and UKIP on 12%. For the Lib Dems, it is further evidence that their vote is holding up where they are competitive. Rather than merely defending their existing 57 seats, the surge of UKIP (which draws around 60% of its support from 2010 Tories) means that the Lib Dems could yet hope to dislodge the Tories in seats where they are vulnerable.

The poll will gladden Labour hearts and darken Tory ones but it's important to remember, as Ashcroft says, that it is "a snapshot", not a prediction. It tells us what would happen were a general election held today, not what is likely to happen in 2015. Governments invariably gain support in the run-up to a general election as voters stop treating opinion polls as a referendum on the government (2010 was typical of this), so Labour needs a large cushion of support to be confident of victory. A similar poll conducted by PoliticsHome in September 2008 suggested the Conservatives would win a landslide majority of 146 seats, while another, carried out in October 2009, pointed to a Tory majority of 70. Just seven months later, Cameron was left with no majority at all. In other words, 18 months out from the general election, only the most optimistic Labourite or the most pessimistic Tory would treat this poll as a reliable indicator of the result.

David Cameron, Ed Miliband and Nick Clegg attend a ceremony at Buckingham Palace to mark the Duke of Edinburgh's 90th birthday on June 30, 2011. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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Voters are turning against Brexit but the Lib Dems aren't benefiting

Labour's pro-Brexit stance is not preventing it from winning the support of Remainers. Will that change?

More than a year after the UK voted for Brexit, there has been little sign of buyer's remorse. The public, including around a third of Remainers, are largely of the view that the government should "get on with it".

But as real wages are squeezed (owing to the Brexit-linked inflationary spike) there are tentative signs that the mood is changing. In the event of a second referendum, an Opinium/Observer poll found, 47 per cent would vote Remain, compared to 44 per cent for Leave. Support for a repeat vote is also increasing. Forty one per cent of the public now favour a second referendum (with 48 per cent opposed), compared to 33 per cent last December. 

The Liberal Democrats have made halting Brexit their raison d'être. But as public opinion turns, there is no sign they are benefiting. Since the election, Vince Cable's party has yet to exceed single figures in the polls, scoring a lowly 6 per cent in the Opinium survey (down from 7.4 per cent at the election). 

What accounts for this disparity? After their near-extinction in 2015, the Lib Dems remain either toxic or irrelevant to many voters. Labour, by contrast, despite its pro-Brexit stance, has hoovered up Remainers (55 per cent back Jeremy Corbyn's party). 

In some cases, this reflects voters' other priorities. Remainers are prepared to support Labour on account of the party's stances on austerity, housing and education. Corbyn, meanwhile, is a eurosceptic whose internationalism and pro-migration reputation endear him to EU supporters. Other Remainers rewarded Labour MPs who voted against Article 50, rebelling against the leadership's stance. 

But the trend also partly reflects ignorance. By saying little on the subject of Brexit, Corbyn and Labour allowed Remainers to assume the best. Though there is little evidence that voters will abandon Corbyn over his EU stance, the potential exists.

For this reason, the proposal of a new party will continue to recur. By challenging Labour over Brexit, without the toxicity of Lib Dems, it would sharpen the choice before voters. Though it would not win an election, a new party could force Corbyn to soften his stance on Brexit or to offer a second referendum (mirroring Ukip's effect on the Conservatives).

The greatest problem for the project is that it lacks support where it counts: among MPs. For reasons of tribalism and strategy, there is no emergent "Gang of Four" ready to helm a new party. In the absence of a new convulsion, the UK may turn against Brexit without the anti-Brexiteers benefiting. 

George Eaton is political editor of the New Statesman.