David Cameron endorses Boris Johnson on campaign trail

16 April 2012 Last updated at 17:58 ET Help

Prime Minister David Cameron said London Mayor Boris Johnson was "firing up the city".

Mr Cameron joined the Conservative mayoral candidate on the campaign trail, meeting entrepreneurs in central London.

He said he was the candidate who "brings people together".

Meanwhile Labour candidate Ken Livingstone visited Croydon where he made transport pledges.

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