Bo Xilai Wiki's Political alignment and affiliations section states that:
In the course of his career, Bo Xilai was the beneficiary of considerable patronage from former Communist Party leader Jiang Zemin. He is thus associated with Jiang’s faction, sometimes referred to as the “elitists,” that is generally known to favor a model that emphasizes free trade, economic development in the coastal regions, and export-led growth.
... By contrast, the “populist” coalition of Hu Jintao and Wen Jiabao advocates more balanced economic development and improvements to China’s social safety net. The populist faction is generally associated with the "left," and comprised rural leaders, socialist intellectuals, and several leaders who rose to prominence through their connections with the Communist Youth League.
Yet, once he became a figure in Chongqing's politics, the ideas and affiliations seemed to have changed 180 degrees:
Although Bo is identified with the elitist bloc for his time in Liaoning and as Minister of Commerce, during his tenure in the interior city of Chongqing, he adopted a number of populist policies more typically associated with the left. Namely, he implemented social housing programs, gave residency status (and therefore the associated social welfare benefits) to rural migrant workers, and emphasized a need for a more balanced distribution of wealth. Although Bo relentlessly pursued technology, capital, and business opportunities, he also spearheaded a large number of government programs to help the working class and disadvantaged groups. Bo’s campaigns against corruption also allegedly seized the assets of private entrepreneurs, in turn funneling these funds into state projects and welfare programs, effectively re-asserting state control over wealth. He also sought to promote “red culture,” and mandated the revival of Mao-era slogans and songs, evoking a time of an egalitarian society.
Is it known what exactly led to such a drastic political idea/orientation change?