Former Home Secretary Alan Johnson says he will not run to succeed Gordon Brown and will back David Miliband to be Labour leader.
Mr Johnson told BBC Radio 4 the party had "a body of great talent" but he said the ex-foreign secretary was a "remarkable politician".
The former post union chief also said he wanted "as many hats in the ring as possible" for the job.
Mr Brown stepped down on Tuesday. Harriet Harman is the acting leader.
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