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Britain's Prime Minister David Cameron delivers a speech to party activists at Christleton High School near Chester in northern England on April 20, 2015. British bookmakers were offering Friday their shortest-ever odds on a hung parliament in next month's general election, with David Cameron's survival as prime minister too close to call. AFP PHOTO / POOL /Toby Melville (Photo credit should read TOBY MELVILLE/AFP/Getty Images)

Britain's Prime Minister David Cameron delivers a speech to party activists at Christleton High School near Chester in northern England on April 20, 2015. British bookmakers were offering Friday their shortest-ever odds on a hung parliament in next month's general election, with David Cameron's survival as prime minister too close to call. AFP PHOTO / POOL /Toby Melville        (Photo credit should read TOBY MELVILLE/AFP/Getty Images)