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Britain's Cameron rallies Conservative party for 'high-stakes, high-risk' election

  • Britain's Prime Minister David Cameron leaves after his live televised interview in west London, Thursday March 26, 2015. Conservative leader Cameron went first in the show Thursday night, facing harsh questions from prominent TV journalist Jeremy Paxman. Miliband, the Labour Party leader, was set to follow, they weren't expected to share a stage at the studio. (AP Photo/Stefan Rousseau, Pool)

    Britain's Prime Minister David Cameron leaves after his live televised interview in west London, Thursday March 26, 2015. Conservative leader Cameron went first in the show Thursday night, facing harsh questions from prominent TV journalist Jeremy Paxman. Miliband, the Labour Party leader, was set to follow, they weren't expected to share a stage at the studio. (AP Photo/Stefan Rousseau, Pool)  (The Associated Press)

  • Britain's Prime Minister David Cameron and his wife Samantha Cameron during a visit to the Salford Royal Hospital in Manchester, England, before speaking at the Conservative Spring Forum, Saturday March 28, 2015. Cameron told a party conference Saturday that "this isn't any election. This is a high-stakes, high-risk election." He continued, "this is a knife-edge election and can only be cut two ways: Conservative or Labour." The campaign officially kicks off Monday, when Parliament is dissolved ahead of the May 7 vote. (AP Photo/PA, Ben Birchall)  UNITED KINGDOM OUT  NO SALES  NO ARCHIVE

    Britain's Prime Minister David Cameron and his wife Samantha Cameron during a visit to the Salford Royal Hospital in Manchester, England, before speaking at the Conservative Spring Forum, Saturday March 28, 2015. Cameron told a party conference Saturday that "this isn't any election. This is a high-stakes, high-risk election." He continued, "this is a knife-edge election and can only be cut two ways: Conservative or Labour." The campaign officially kicks off Monday, when Parliament is dissolved ahead of the May 7 vote. (AP Photo/PA, Ben Birchall) UNITED KINGDOM OUT NO SALES NO ARCHIVE  (The Associated Press)

  • Labour Party leader Ed Miliband boards his General Election battle bus for the first time, as the Labour Party officially launch their 2015 General Election campaign at the Olympic Park in London Friday March 27, 2015. Britain will hold a General Election on Thursday May 7, 2015. (AP Photo/ Stefan Rousseau/PA) UNITED KINGDOM OUT

    Labour Party leader Ed Miliband boards his General Election battle bus for the first time, as the Labour Party officially launch their 2015 General Election campaign at the Olympic Park in London Friday March 27, 2015. Britain will hold a General Election on Thursday May 7, 2015. (AP Photo/ Stefan Rousseau/PA) UNITED KINGDOM OUT  (The Associated Press)

Prime Minister David Cameron says Britain's election campaign is on a knife edge as he rallies his Conservative party ahead of the close-fought race.

Cameron told a party conference Saturday that "this isn't any election. This is a high-stakes, high-risk election."

He continued, "this is a knife-edge election and can only be cut two ways: Conservative or Labour."

The campaign officially kicks off Monday, when Parliament is dissolved ahead of the May 7 vote.

Polls suggest no party will win a majority of seats.

Opposition Labour leader Ed Miliband launched his campaign Friday from the top of London's Orbit tower, promising to preserve the cash-strapped National Health Service.

Cameron also made the NHS a priority, vowing to ensure people have access to doctors and hospital services seven days a week.