Corby shows how a Lib Dem collapse will hurt the Tories

A fall in support for the Lib Dems will propel Labour to victory in Tory marginals.

One the most notable things about the result of the Corby by-election is the collapse of the Lib Dem vote. The party saw its share of the vote fall from 14.5 per cent to just 5 per cent as it was pushed into fourth place by Ukip, which won nearly three times as many votes (5,108 to 1,770).

Many of those who voted for the Lib Dems in 2010 will have defected to Labour, which saw its vote increase by 9.8% to 48.4%, propelling the party to victory against the Conservatives. If this patten is repeated at the general election, the Tories stand to lose dozens of seats - there are 37 Conservative-Labour marginals where the third place Lib Dem vote is more than twice the margin of victory. Even if Nick Clegg's party partially recovers before 2015, Labour will make sweeping gains. In addition, while existing Lib Dem MPs, many of whom enjoy large local followings, are likely to benefit from an incumbency effect, it is the Tories, not Labour, who will suffer as a result - David Cameron's party is in second place in 38 of the Lib Dems' 57 seats.

If they are to stand any chance of winning a majority at the next election or even remaining the largest single party, the Tories need to hope for a Lib Dem recovery.

The Liberal Democrats lost their deposit in the Corby by-election after finishing fourth behind Ukip. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

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Benn vs McDonnell: how Brexit has exposed the fight over Labour's party machine

In the wake of Brexit, should Labour MPs listen more closely to voters, or their own party members?

Two Labour MPs on primetime TV. Two prominent politicians ruling themselves out of a Labour leadership contest. But that was as far as the similarity went.

Hilary Benn was speaking hours after he resigned - or was sacked - from the Shadow Cabinet. He described Jeremy Corbyn as a "good and decent man" but not a leader.

Framing his overnight removal as a matter of conscience, Benn told the BBC's Andrew Marr: "I no longer have confidence in him [Corbyn] and I think the right thing to do would be for him to take that decision."

In Benn's view, diehard leftie pin ups do not go down well in the real world, or on the ballot papers of middle England. 

But while Benn may be drawing on a New Labour truism, this in turn rests on the assumption that voters matter more than the party members when it comes to winning elections.

That assumption was contested moments later by Shadow Chancellor John McDonnell.

Dismissive of the personal appeal of Shadow Cabinet ministers - "we can replace them" - McDonnell's message was that Labour under Corbyn had rejuvenated its electoral machine.

Pointing to success in by-elections and the London mayoral election, McDonnell warned would-be rebels: "Who is sovereign in our party? The people who are soverign are the party members. 

"I'm saying respect the party members. And in that way we can hold together and win the next election."

Indeed, nearly a year on from Corbyn's surprise election to the Labour leadership, it is worth remembering he captured nearly 60% of the 400,000 votes cast. Momentum, the grassroots organisation formed in the wake of his success, now has more than 50 branches around the country.

Come the next election, it will be these grassroots members who will knock on doors, hand out leaflets and perhaps even threaten to deselect MPs.

The question for wavering Labour MPs will be whether what they trust more - their own connection with voters, or this potentially unbiddable party machine.