Activists erect a banner on Khon Kaen's Democracy Monument that says, "Here there stands only a ‘monument’ but no ‘democracy,’ which has now disappeared. RIP democracy."

Activists erect a banner on Khon Kaen’s Democracy Monument that says, “Here there stands only a ‘monument’ but no ‘democracy,’ which has now disappeared. RIP democracy.”

KHON KAEN—Student activists in Khon Kaen wrapped a black banner around the city’s Democracy Monument on Saturday to condemn the Constitutional Court’s annulment of the February 2 election.

Thailand’s Constitutional Court judges ruled in a 6-to-3 vote on Friday to nullify the election because of a constitutional clause that requires voting to be held in every part of the country on the same day. Voting was not held in every constituency on February 2 because anti-government protesters prevented candidates from registering in 28 districts in southern Thailand.

The ruling raises many questions about how the country will resolve the political stalemate that has left it without a fully functioning government for months. The court’s decision may also set a troublesome precedent in which entire elections can be voided if protesters succeed at blocking voting in a single district.

Voting in the 28 constituencies that were unable to field candidates on February 2 was expected to take place at a later date, but the court’s ruling requires a new election to be held countrywide.

The Election Commission has not announced when the new poll will take place but said it could more than two months from now.

With a complete legislature even further from being formed, and Prime Minister Yingluck Shinawatra’s status on the line as she faces impeachable charges from the National Anti-Corruption Commission (NAAC), Thailand’s judiciary branch is emerging as one of the most powerful players in the country’s political crisis.

“I think the [Constitutional Court] has trampled on our democracy just to get rid of this government,” said 18-year-old Chongphithack Namlao, who helped organize Saturday’s demonstration. “We cannot exchange the whole democratic system simply to chase away the current government.”

Activists took turns speaking over a loudspeaker to a small crowd gathered around the shrouded monument in Khon Kaen.

“We are not Red Shirts or Yellow Shirts,” announced a student. “We are dressed in black to say that our democratic system is dying.”

A Red Shirt rally in protest of the court’s ruling was also planned for Saturday in Khon Kaen, but it was canceled at the last minute, said radio D.J. and Red Shirt leader Bhutdhipong Khanhaengpon.

Mr. Bhutdhipong said that many Red Shirt supporters in Khon Kaen are angry over the election’s nullification, but they don’t want to cause any additional problems for the already beleaguered caretaker government.

“We are thinking more than we did in 2010 because we don’t want to lose anybody on the streets anymore, and if we do anything under this government it might just give them more trouble,” said Mr. Bhutdhipong.  “For now, we are just waiting. If something else happens, like a coup or an attempt to replace this government with an unelected one, that will be the last straw.”

“If the UDD needs them, the people here are ready to join.” added Mr. Bhutdhipong, in reference to the United Front for Democracy Against Dictatorship, a Red Shirt political group whose leaders have made increasingly militant remarks in recent weeks.

In addition to uncertainty over when a fresh poll will be rescheduled, there is concern over how the government will avoid another invalidated election if protesters decide to blockade polls again.

Legal expert and political commentator Verpat Pariyawong expressed worry over the precedent that Friday’s court ruling could set.

“The reasoning of the court is paving ways for anyone to have the power to nullify an entire election simply by obstructing candidates from registering in a single district,” said Mr. Verpat.

Although the protests in Bangkok have dwindled over the past month, Suthep Thaugsuban, the leader of the opposition movement, vowed before a crowd of supporters on Thursday to obstruct any attempts to hold a new election before national reforms are implemented.

Anti-government leader Kamol Kitkasitwat, the chairman of Khon Kaen’s PDRC chapter, reiterated the necessity of carrying out reforms before a new election is held.

“Everyone needs to accept that we have to reform,” said Mr. Kamol. “People in Khon Kaen should watch and listen to what happens in Bangkok. If anything happens that we don’t want to see, we are going to have street rallies again.”

The Democrat Party, which boycotted the February 2 poll, has not yet said whether it will participate in the rescheduled election.