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Facing tough election, Britain's Cameron seeks Merkel's support for plans to change the EU

  • German Chancellor Angela Merkel, left walks with British Prime Minister David Cameron at the British Museum during Merkel's visit to the capital, in London, Wednesday, Jan. 7, 2015. The German leader is in London for talks, and Cameron is hoping she'll support his plan to keep the U.K. within a reformed European Union. (AP Photo/ Dan Kitwood, Pool)

    German Chancellor Angela Merkel, left walks with British Prime Minister David Cameron at the British Museum during Merkel's visit to the capital, in London, Wednesday, Jan. 7, 2015. The German leader is in London for talks, and Cameron is hoping she'll support his plan to keep the U.K. within a reformed European Union. (AP Photo/ Dan Kitwood, Pool)  (The Associated Press)

  • British Prime Minister David Cameron and German Chancellor Angela Merkel walk together before their meeting in 10 Downing Street, London, Wednesday, Jan. 7, 2015.  The German Chancellor is in London for one of talks. (AP Photo/Matt Dunham)

    British Prime Minister David Cameron and German Chancellor Angela Merkel walk together before their meeting in 10 Downing Street, London, Wednesday, Jan. 7, 2015. The German Chancellor is in London for one of talks. (AP Photo/Matt Dunham)  (The Associated Press)

  • German Chancellor Angela Merkel, right, speaks during a joint news conference with British Prime Minister David Cameron following their talks at 10 Downing Street, London, Wednesday, Jan. 7, 2015. Cameron and Merkel expressed their condolences and support to French President Francois Hollande after the deadly gun attack on satirical newspaper Charlie Hebdo. (AP Photo/John Stillwell, Pool)

    German Chancellor Angela Merkel, right, speaks during a joint news conference with British Prime Minister David Cameron following their talks at 10 Downing Street, London, Wednesday, Jan. 7, 2015. Cameron and Merkel expressed their condolences and support to French President Francois Hollande after the deadly gun attack on satirical newspaper Charlie Hebdo. (AP Photo/John Stillwell, Pool)  (The Associated Press)

She has no vote in Britain, but German Chancellor Angela Merkel could be key to Prime Minister David Cameron's re-election hopes.

The German leader is in London for talks, and Cameron is hoping she'll support his plan to keep the U.K. within a reformed European Union.

With anti-EU sentiment rising, Cameron has promised a membership referendum if he wins May's election. He wants Britain to stay in the EU, but needs reforms to sell the idea to his Conservative party, and to voters.

Cameron wants Merkel's support for a plan to impose limits on movement of people within the 28-nation bloc.

Merkel, who broadly shares Cameron's center-right economic stance, has indicated she may support restrictions on benefits for migrants, but has insisted the free movement of workers is non-negotiable.