By Axel Bugge LISBON (Reuters) - Portugal's ruling centre-right coalition took a decisive lead over the centre-left Socialists in a poll published on Wednesday, marking the first clear trend change in an election race that has been stuck in a dead heat for many months. The poll suggests for the first time that the centre-right coalition could return to power in an Oct. 4 election focussed on how to consolidate Portugal's success at leaving a debt crisis and financial bailout behind and return to growth. Portugal has been called a European poster child at reform and austerity under the bailout which it exited last year, sharply contrasting it with Greece, which not long ago some analysts feared it would join in an economic abyss.