UK's EU referendum: Brexit opponents surge as Cameron strikes alliance with Labour London Mayor Sadiq Khan to rally young voters

"One of the big problems the 'remain' camp has is that the Labour Party leadership is not campaigning convincingly to stay in the EU," said Simon Tilford, deputy director of the Centre for European Reform in London. "Having won the mayor's post, [Khan] has credibility. He appeals to the young and the ethnic vote. And he is savvy about the media."

...Voters who backed Khan will be a key constituency in the referendum next month, and, fresh off his mayoral victory, he has a good shot at rallying them to the European cause. A higher turnout favors the “remain” campaign. "If everyone who’s eligible to vote would vote," the Centre for European Reform’s Tilford said, "it would be overwhelmingly in favour of staying."