My knowledge of Thailand is minimal, but each time the BBC have reported on events in Bangkok there is a reference to the tensions between the city's middle classes, who support one side and the rural populace who support another. Is this a an urban -v- rural conflict, rather than one over ideology? Maybe not, just between politicians.

I'd forgotten there is a history the miltary doing this:
Thailand's armed forces have staged at least 12 coups since the end of the absolute monarchy in 1932.

There has been a power struggle since Ms Yingluck's brother, Thaksin Shinawatra, was ousted by the military as PM in 2006. Mr Thaksin and Ms Yingluck have strong support in rural areas but are opposed by many in the middle class and urban elite.

The latest unrest began last year, when anti-government protesters embarked on a campaign to oust Ms Yingluck. An election was held in February but was disrupted and later annulled by the judiciary.
Link:http://www.bbc.co.uk/news/world-asia-27553029