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A state of emergency is still in effect, and the top protest leaders are in detention.

The Pheu Thai Party is closely aligned with the Red Shirt movement by way of their shared support for Mr. Thaksin, who is in self-imposed exile after fleeing ahead of a corruption conviction in 2007.

Pheu Thai points out handicaps under which it campaigns — generally hostile mainstream media; censorship of its own print, broadcast and Internet organs; and Mr. Kokaew’s detention.

The constituency where the election took place is considered Democrat territory, and the party also counted on a backlash caused by the violence associated with the Red Shirt movement. But during the protests it was clear that many in Bangkok supported — or were at least sympathetic to — the Red Shirt cause of greater social and economic equality.

Grant Peck and Kinan Suchaovanich contributed to this report.