Days before a referendum that seemed to be in the bag for David Cameron, a YouGov Plc poll suddenly showed the “Leave” side ahead. The pound plunged, the prime minister panicked -- then Scotland voted to stay in the U.K. by a 10-point margin.
Two years on, and British voters are preparing to decide whether to leave the European Union on June 23. The question for politicians and pollsters studying the current referendum is whether recent polls showing “Leave” in the lead, including ones from YouGov and TNS on Monday, are just a symptom of...
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