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Campaign formally begins for most unpredictable election in Britain for decades

  • The sun rises behind the Palace of Westminster and the statue of Sir Winston Churchill in central London Monday March 30, 2015. Britain's Prime Minister David Cameron will visit the Queen Elizabeth II on Monday for a final audience ahead of the May 7 General Election formally marking the end of the five-year coalition government.  (AP Photo/PA, Andrew Matthews)  UNITED KINGDOM OUT: NO SALES: NO ARCHIVE

    The sun rises behind the Palace of Westminster and the statue of Sir Winston Churchill in central London Monday March 30, 2015. Britain's Prime Minister David Cameron will visit the Queen Elizabeth II on Monday for a final audience ahead of the May 7 General Election formally marking the end of the five-year coalition government. (AP Photo/PA, Andrew Matthews) UNITED KINGDOM OUT: NO SALES: NO ARCHIVE  (The Associated Press)

  • Britain'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)

    Britain'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)  (The Associated Press)

  • Britain's Prime Minister David Cameron arrives for a private audience with Queen Elizabeth II at Buckingham Palace, London  Monday March 30, 2015.  Cameron paid a farewell visit to Queen Elizabeth II on Monday, the first day of formal campaigning for the most unpredictable election in decades.  (AP Photo/Anthony Devlin/Pool)

    Britain's Prime Minister David Cameron arrives for a private audience with Queen Elizabeth II at Buckingham Palace, London Monday March 30, 2015. Cameron paid a farewell visit to Queen Elizabeth II on Monday, the first day of formal campaigning for the most unpredictable election in decades. (AP Photo/Anthony Devlin/Pool)  (The Associated Press)

Britain's prime minister David Cameron is paying a farewell visit to Queen Elizabeth II as the country begins formal campaigning for an election seen as the most unpredictable in decades.

The audience comes as Britain's Parliament was dissolved ahead of the May 7 vote.

Voters failed to produce a majority for the Conservative Party or the Labour Party in the House of Commons in 2010, and the electoral landscape is fractured again. Minor parties — such as the Scottish and Welsh nationalists, Greens and anti-Europeans — could hold the balance of power.

Cameron and opposition leader Ed Miliband are focusing on the economy Monday. Cameron is warning of economic chaos under Labour while Miliband says the Tory position on a European Union referendum offers "clear and present danger" to business.