MANCHESTER, ENGLAND - APRIL 15: (EDITOR'S NOTE: Alternative crop of image #521392588) London Mayor Boris Johnson addresses supporters during a rally for the 'Vote Leave' campaign on April 15, 2016 in Manchester, England. Boris Johnson is taking part in a 48 hour 'Brexit Blitz' of campaigning in Northern England. Britain will vote either to leave or remain in the EU in a referendum on June 23. (Photo by Christopher Furlong/Getty Images) Boris Johnson Leads 48Hour Brexit Blitz Of Campaigning Sizes: 150 × 150 / 300 × 195 / 768 × 499 / 1.024 × 665 / 600 × 390 / 175 × 131 / 770 × 500 / 45 × 45 / 1.024 × 665