(01 of13)
Open Image ModalLONDON, ENGLAND - MARCH 30: British Prime Minister David Cameron leaves Downing Street for Buckingham Palace on March 30, 2015 in London, England. Campaigning in what is predicted to be Britain's closest national election in decades will start after Queen Elizabeth II dissolves Parliament today. (Photo by Carl Court/Getty Images) (credit:Carl Court via Getty Images)
(02 of13)
Open Image ModalDeputy Prime Minister Nick Clegg outside the Cabinet Office, London, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a £3,000 tax hike for every working family. (credit:Stefan Rousseau/PA Wire)
(03 of13)
Open Image ModalEd Miliband, leader of the U.K. opposition Labour Party, pauses during his address at Bloomberg LP's European headquarters in London, U.K., on Monday, March 30, 2015. Miliband set out his party's pledges to British businesses, seeking to offset concerns that a Labour government would work against them by reiterating his party's commitment to keeping the U.K. in the European Union. Photographer: Jason Alden/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
(04 of13)
Open Image ModalPrime Minister David Cameron leaves Downing Street, London, for a private audience with Queen Elizabeth II at Buckingham Palace, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a £3,000 tax hike for every working family. (credit:Andrew Matthews/PA Wire)
(05 of13)
Open Image ModalPrime Minister David Cameron as he arrives for a private audience with Queen Elizabeth II at Buckingham Palace, London, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a £3,000 tax hike for every working family. (credit:Anthony Devlin/PA Wire)
(06 of13)
Open Image ModalBritain's Prime Minister David Cameron leaves Downing Street to see Queen Elizabeth II for the official dissolution of Parliament, in London, Monday, March 30, 2015. The United Kingdom will go to the polls for a general election on May 7. (AP Photo/Alastair Grant) (credit:Alastair Grant/AP)
(07 of13)
Open Image ModalLONDON, ENGLAND - MARCH 30: Leader of the Labour party Ed Miliband leaves his home on March 30, 2015 in London, England. Mr Miliband will speak to members of the business community today where it is expected he will warn of the dangers of an EU referendum, a conservative party pledge. British Prime Minister David Cameron will visit Queen Elizabeth II at Buckingham Palace today as Parliament dissolves and the parties begin their campaigns ahead of the May 7 general election. (Photo by Dan Kitwood/Getty Images) (credit:Dan Kitwood via Getty Images)
(08 of13)
Open Image ModalLONDON, UNITED KINGDOM - MARCH 30: United Kingdom Independence Party leader Nigel Farage holds up a pledge card as he arrives in Westminster on March 30, 2015 in London, England. Campaigning in what is predicted to be Britain's closest national election in decades will start after Queen Elizabeth II dissolves Parliament today. Polling day is on May 7, 2015. (Photo by Peter Macdiarmid/Getty Images) (credit:Peter Macdiarmid via Getty Images)
(09 of13)
Open Image ModalNatalie Bennett, leader of the Green Party, sits and listens during the party's spring conference in Liverpool, U.K., on Friday, March 6, 2015. Bennett will seek to restore her image today after 10 days of being lampooned for the botched launch of her campaign for the U.K. election May 7. Photographer: Chris Ratcliffe/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
(10 of13)
Open Image ModalNicola Sturgeon, Scotland's first minister and leader of the Scottish National Party (SNP), waits off stage before speaking at a Spring Conference event in Glasgow, U.K., on Saturday, March 28, 2015. Polls show the SNP may win as many as 50 of Scotland's 59 districts at the U.K. election on May 7 and become the third-biggest party in the House of Commons in Westminster. Photographer: Chris Ratcliffe/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
(11 of13)
Open Image ModalA fox makes its way past 10 Downing Street, London, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a £3,000 tax hike for every working family. (credit:Andrew Matthews/PA Wire)
(12 of13)
Open Image ModalDowning Street cat Larry and a police sniffer dog meet on the steps of 10 Downing Street, London, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a 3,000 tax hike for every working family. (credit:Andrew Matthews/PA Wire)
(13 of13)
Open Image ModalA light from a TV camera lights a pathway towards 10 Downing Street, London, as one of the most closely-contested general elections for decades formally gets under way today, with David Cameron accusing Labour of planning a £3,000 tax hike for every working family. (credit:Andrew Matthews/PA Wire)