"After the vote, the EC will be taken to court if it refuses to rule on campaign fraud involving the minor parties," Democrat deputy secretary-general Thaworn Senniam said in reference to the Thai Rak Thai Party's alleged funding of candidates from small parties.

Thaworn warned the EC it was fast losing its credibility due to its perceived favouritism towards the ruling party.

In regard to disqualifications, two Trang candidates were removed from the race by a Supreme Court ruling.

The two are Patipat Kiarttheerawichai and Charat Maneesri, both of the Pattana Chart Thai party, who had failed to register their party memberships before the 90-day limit.

In Suphan Buri, 18 of 26 candidates were disqualified because 17 had violated the 90-day rule and one had dual party membership.

The eight candidates remaining in the race include five from the ruling party and three from small parties. Two of the five Thai Rak Thai candidates will run unopposed and need 20 per cent of the vote for victory.

In Phuket two Thai Rak Thai candidates are involved in one-horse races in their constituencies after the disqualification of minor-party candidates.

In Ranong, the Thai Citizen Party's Supha Tanthajina won his appeal to restore his candidacy and resumed his race with Thai Rak Thai's Pairoj Chanpanit.

In Ubon Ratchathani, nine Thai Rak Thai candidates found themselves running unopposed when other candidates were booted out for not being members of their small parties for 90 days.

In Phatthalung, seven minor party candiates were disqualified while one disqualified candidate in Constituency One, Khemawut Suwan of Pattana Chart Thai, was reinstated.