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Nigel Farage, leader of the U.K. Independence Party (UKIP), reacts as he launches the party's 2015 general election manifesto at the Thurrock Hotel, ahead of the May 7 general election, in Thurrock, U.K., on Wednesday, April 15, 2015. Farage said his U.K. Independence Party's policies of increasing police, health and defense spending while cutting taxes are "fully costed" and "serious" as the party stands on the brink of its most successful ever general-election campaign. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Nigel Farage, leader of the U.K. Independence Party (UKIP), reacts as he launches the party's 2015 general election manifesto at the Thurrock Hotel, ahead of the May 7 general election, in Thurrock, U.K., on Wednesday, April 15, 2015. Farage said his U.K. Independence Party's policies of increasing police, health and defense spending while cutting taxes are "fully costed" and "serious" as the party stands on the brink of its most successful ever general-election campaign. Photographer: Chris Ratcliffe/Bloomberg via Getty Images