LONDON (AP) — London Mayor Boris Johnson, a leader of the campaign for Britain to leave the European Union, was facing strong criticism Friday for suggesting U.S. President Barack Obama may have an "ancestral dislike of the British Empire" because of his Kenyan roots. On a visit to the U.K., Obama weighed in to Britain's debate about European Union membership, urging voters to back staying in the 28-nation bloc. The president wrote in the Daily Telegraph newspaper that the EU "enhances Britain's global leadership." His intervention angered campaigners for a "leave" vote in the June 23 referendum, who accused the...