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As expected, Greens fall back to 5 per cent in Ashcroft’s weekly poll

Today’s poll blast: the Greens fall back below the Lib Dems, as we forecast last week.

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Last Monday we looked at how Lord Ashcroft's weekly poll was probably putting the Greens too high at 8 per cent.

"…we should be wary of the finding: Ashcroft’s data suggests 28 per cent of 18-24 year olds are now planning to vote Green.

"There are only 56 weighted 18-24 year olds in Ashcroft’s poll – so we can’t say 28 per cent of them are actually going to vote Green.

"…this is only one poll. We should hesitate to say 8 per cent of the population are now converts. … We can only take sub-breaks seriously over time. And YouGov’s have shown the party’s youthful support at far lower levels than today’s poll implies."

This didn't stop the Guardian declaring a poll "surge" for the party, and talking of multiple "polls" putting them on 8 per cent. John Harris' anti-establishment roadshow was duly dispatched to Bristol West, which the party is targeting.

Now Ashcroft's weekly poll has put the party back at 5 per cent.

So much for the surge.

The Greens shouldn't be ignored, and perhaps should be in the leaders' debates, but last week was a case study in the way some pundits can blow up the modest findings of pollsters.

The full data tables for each poll can be found here (last week) and here (today).

This is how the percentage of each age group supporting the Greens changed over the two polls:

This explains why the Greens have dipped back down to 5 per cent.

Last week's poll gave a headline of "8 per cent Green" because 42 of the 517 weighted respondents backed the party. 16 of them were 18-24 year olds (out of 56 weighted respondents – i.e. 28 per cent – but this is based on 38 actual replies. Only 11 18-24 year olds would have actually said they would vote Green but the age group's poor response rate meant they were made into 16).

This compares to 4 out of 44 18-24 year olds this week (35 actual replies), and 28 out of 511 respondents overall (i.e. 5.4, or 5, per cent).

These are clearly small numbers, and scarcely ones that should be shaping column inches. The margin of error for 500 respondents is nearly 5 per cent. The data is useful over time. The fault isn't with Ashcroft or any other pollster (we looked at how YouGov's Scottish sub-polls were distorted by the Mail and Breitbart last week), but the way polls are reported.

For a more in-depth look at the Green vote, Peter Kellner today looked at how three weeks of YouGov samples have put the party on around 5, rather than 8, per cent.

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May2015 is the New Statesman's new elections site. Explore it for data, interviews and ideas on the general election.

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Could Jeremy Corbyn still be excluded from the leadership race? The High Court will rule today

Labour donor Michael Foster has applied for a judgement. 

If you thought Labour's National Executive Committee's decision to let Jeremy Corbyn automatically run again for leader was the end of it, think again. 

Today, the High Court will decide whether the NEC made the right judgement - or if Corbyn should have been forced to seek nominations from 51 MPs, which would effectively block him from the ballot.

The legal challenge is brought by Michael Foster, a Labour donor and former parliamentary candidate. Corbyn is listed as one of the defendants.

Before the NEC decision, both Corbyn's team and the rebel MPs sought legal advice.

Foster has maintained he is simply seeking the views of experts. 

Nevertheless, he has clashed with Corbyn before. He heckled the Labour leader, whose party has been racked with anti-Semitism scandals, at a Labour Friends of Israel event in September 2015, where he demanded: "Say the word Israel."

But should the judge decide in favour of Foster, would the Labour leadership challenge really be over?

Dr Peter Catterall, a reader in history at Westminster University and a specialist in opposition studies, doesn't think so. He said: "The Labour party is a private institution, so unless they are actually breaking the law, it seems to me it is about how you interpret the rules of the party."

Corbyn's bid to be personally mentioned on the ballot paper was a smart move, he said, and the High Court's decision is unlikely to heal wounds.

 "You have to ask yourself, what is the point of doing this? What does success look like?" he said. "Will it simply reinforce the idea that Mr Corbyn is being made a martyr by people who are out to get him?"