‘There Has Been a Change in the Mood.’ Britain’s Vince Cable Leads the Charge to Reverse Brexit

London has a reputation for bad weather, but on Oct. 20 at about midday, the sky was a perfect blue. That was good news for Vince Cable, the leader of the U.K.’s centrist Liberal Democrats party. Buoyed by the lack of rain, he and roughly 700,000 others marched on the Houses of Parliament to call for a “People’s Vote,” or second referendum, on Britain’s withdrawal from the European Union.