Politics

Has “Leave” really just shot to a ten point lead? Don’t be so sure

It would be wise to view a new poll with caution

January 08, 2018
Anti-Brexit protesters take part in a Stop Brexit march in Manchester city centre  to coincide with Conservative Party conference in October. According to some new polling, they aren't having much luck at the moment. Photo: Matt Crossick/Matt Crossick/Emp
Anti-Brexit protesters take part in a Stop Brexit march in Manchester city centre to coincide with Conservative Party conference in October. According to some new polling, they aren't having much luck at the moment. Photo: Matt Crossick/Matt Crossick/Emp

Just before Christmas, I warned Remainers not to get too excited about a poll showing a ten point lead for staying in the EU. The opposite now applies. In his latest column for the Sunday Times, Dominic Lawson reports a YouGov poll showing a Leave lead widening from two to nine points in the past three months. Once again, I doubt whether there has been any real shift in public opinion.

The poll Lawson cites was one of YouGov’s Eurotracker series. It is conducted monthly, but this particular question is asked less frequently. This is how it is worded:

At this point would you prefer that Britain stays in or leaves the European Union?

In early October, it found a 46-44 per cent margin in favour of leaving; in the latest survey, conducted just before Christmas, the Leave advantage had widened to 48-39 per cent.

It is just possible that the shift is the result of sampling fluctuation. However, that is unlikely to be the whole explanation: a five point drop in the Remain percentage looks too large.

There is, though, another explanation. It concerns polling methods rather than shifts in public attitudes. A new question was added to the December poll that was not asked in October:

Martin Schulz, party leader of the Social Democrats in Germany (SPD) announced at the SPD party congress his vision to transform the European Union into the United States of Europe by 2025 with a common constitutional treaty. EU members who do not agree with this federal constitution would then automatically have to leave the EU. Generally speaking, do you support or oppose the vision of the United States of Europe by 2025?

Only 10 per cent of British voters back this idea.

The Remain-Leave question was asked immediately afterwards. Respondents were asked about Brexit with the threat (or, for 10 per cent, dream) of a “United States of Europe” fresh in their minds. By inserting this extra question at this place in the survey, YouGov may well have affected the result of its Remain-Leave tracker question.

For years, survey researchers have known of the “order effect”: the words, thoughts and propositions of particular questions may affect the way respondents think about subsequent questions. The point was made with wonderful satirical effect some years ago in an episode of Yes Prime Minister. The scene can be viewed on YouTube.

YouGov itself provides the best evidence that public opinion has in fact been stable since early autumn. In its separate tracker series for the Times, YouGov regularly asks:

In hindsight, do you think Britain was right or wrong to vote to leave the European Union?

Each time, this question is asked after the same preceding question, about the way the government is handling the Brexit negotiations. In the three months leading up to Christmas, YouGov asked the right/wrong question eight times. On each occasion, there was a “wrong” lead ranging from one to five points, with 42-44 per cent saying we were right to vote for Brexit, and 44-47 per cent saying we were wrong. This time, sampling fluctuations CAN—and in my view, almost certainly do—explain the tiny shifts from poll to poll.

The real message from YouGov’s data is that there is some, though not yet much, buyers’ remorse among people who voted for Brexit; although there are some people who are not keen on Brexit but, having embarked on the process, feel it would be better to go through with it than to turn back. All in all, the electorate remains fairly evenly divided. Whether a bigger shift is to come and, if so, in which direction, will be one of the most important things we shall find out in 2018.

PS. The idea of a United States of Europe has been knocking around for a long time. Churchill used—arguably coined—the very term back in 1930. Martin Schulz is only the latest politician to promote it. However, it would need a major revision to the EU treaties to bring it about, and these require unanimity among EU members. Any single country could veto it. In other words, there is simply no way that the UK, if it stayed in the EU, could be forced to sign up to Schulz’s plan, on pain of “automatic” expulsion if it refused.

 






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