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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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Who will win in Stoke-on-Trent?

Labour are the favourites, but they could fall victim to a shock in the Midlands constituency.  

The resignation of Tristram Hunt as MP for Stoke-on-Central has triggered a by-election in the safe Labour seat of Stoke on Trent Central. That had Westminster speculating about the possibility of a victory for Ukip, which only intensified once Paul Nuttall, the party’s leader, was installed as the candidate.

If Nuttall’s message that the Labour Party has lost touch with its small-town and post-industrial heartlands is going to pay dividends at the ballot box, there can hardly be a better set of circumstances than this: the sitting MP has quit to take up a well-paid job in London, and although  the overwhelming majority of Labour MPs voted to block Brexit, the well-advertised divisions in that party over the vote should help Ukip.

But Labour started with a solid lead – it is always more useful to talk about percentages, not raw vote totals – of 16 points in 2015, with the two parties of the right effectively tied in second and third place. Just 33 votes separated Ukip in second from the third-placed Conservatives.

There was a possible – but narrow – path to victory for Ukip that involved swallowing up the Conservative vote, while Labour shed votes in three directions: to the Liberal Democrats, to Ukip, and to abstention.

But as I wrote at the start of the contest, Ukip were, in my view, overwritten in their chances of winning the seat. We talk a lot about Labour’s problem appealing to “aspirational” voters in Westminster, but less covered, and equally important, is Ukip’s aspiration problem.

For some people, a vote for Ukip is effectively a declaration that you live in a dump. You can have an interesting debate about whether it was particularly sympathetic of Ken Clarke to brand that party’s voters as “elderly male people who have had disappointing lives”, but that view is not just confined to pro-European Conservatives. A great number of people, in Stoke and elsewhere, who are sympathetic to Ukip’s positions on immigration, international development and the European Union also think that voting Ukip is for losers.

That always made making inroads into the Conservative vote harder than it looks. At the risk of looking very, very foolish in six days time, I found it difficult to imagine why Tory voters in Hanley would take the risk of voting Ukip. As I wrote when Nuttall announced his candidacy, the Conservatives were, in my view, a bigger threat to Labour than Ukip.

Under Theresa May, almost every move the party has made has been designed around making inroads into the Ukip vote and that part of the Labour vote that is sympathetic to Ukip. If the polls are to be believed, she’s succeeding nationally, though even on current polling, the Conservatives wouldn’t have enough to take Stoke on Trent Central.

Now Theresa May has made a visit to the constituency. Well, seeing as the government has a comfortable majority in the House of Commons, it’s not as if the Prime Minister needs to find time to visit the seat, particularly when there is another, easier battle down the road in the shape of the West Midlands mayoral election.

But one thing is certain: the Conservatives wouldn’t be sending May down if they thought that they were going to do worse than they did in 2015.

Parties can be wrong of course. The Conservatives knew that they had found a vulnerable spot in the last election as far as a Labour deal with the SNP was concerned. They thought that vulnerable spot was worth 15 to 20 seats. They gained 27 from the Liberal Democrats and a further eight from Labour.  Labour knew they would underperform public expectations and thought they’d end up with around 260 to 280 seats. They ended up with 232.

Nevertheless, Theresa May wouldn’t be coming down to Stoke if CCHQ thought that four days later, her party was going to finish fourth. And if the Conservatives don’t collapse, anyone betting on Ukip is liable to lose their shirt. 

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.