London - The left-wing maverick, Mr Ken Livingstone, remains the overwhelming favourite among London Labour supporters to become the capital's first elected mayor, an opinion poll showed yesterday. An ICM survey in the Evening Standard newspaper showed 50 per cent of Labour voters in the capital backed "Red Ken", 16 per cent backed the former transport minister, Ms Glenda Jackson, and only 15 per cent went for Mr Frank Dobson, Prime Minister Blair's chosen man.