Mass protests after the fire on October 30, 2015 that claimed 64 lives -- and which was blamed on corruption -- forced premier Victor Ponta and his Social Democrats (PSD) to resign.
But exit polls today, 13 months later, put the PSD well ahead its rivals on around 45 percent of the vote, even better than expected.
The rival centre-right National Liberal Party (PNL) trailed on around 21 percent, while their allies the Save Romania Union (USR), newly created by a mathematician-turned-activist, was on nine percent.
Official results weren't due before tomorrow.
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Romania has been run since Ponta's departure by a caretaker government under technocrat Prime Minister Dacian Ciolos, 47, a former European commissioner.
The PNL and the USR have said they would support Ciolos staying on. He is happy to do so but wants to remain an independent, vowing continued budgetary discipline.
But the PSD wants to install instead party head Liviu Dragnea, 54, as premier.
This would also exclude a comeback by Ponta, 44, currently on trial -- in fact he was already in the dock as prime minister -- for alleged tax evasion and money laundering, charges he denies.
The inferno inside the Colectiv club was blamed on bent officials turning a blind eye to a lack of fire precautions. Poor medical care exacerbated the death toll.
For many Romanians it was the final straw, and the tragedy prompted a push to clean Romania up.
A recent survey suggested that 95 percent of Romanians want tackling corruption to be a priority for the next government.
But there are worries this will not happen if the PSD returns to power.
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