AFP/Tunis

Ahead of the final day of campaigning for tomorrow’s landmark second-round vote, jihadists brandished a videotaped threat against the country’s political establishment.

Essebsi and Marzouki were to hold last rallies on the capital’s Avenue Bourguiba, a focal point of the 2011 revolution that toppled longtime ruler Zine al-Abidine Ben Ali.

Capping off four years of a sometimes chaotic transition, the vote will be the first time Tunisians freely elect their president since independence from France in 1956.

Amid tight security and the closure of main border posts with strife-torn neighbour Libya, almost 5.3mn Tunisians are being called to the ballot boxes. Tunisians abroad started voting yesterday.

The first round, on November 23, saw Essebsi, who heads the anti-Islamist Nidaa Tounes party, take 39% of the vote.

Marzouki, a 69-year-old former rights activist installed by parliament two months after December 2011 polls, took 33%.

Nidaa Tounes won parliamentary elections in October and Essebsi has emerged as the clear favourite to be Tunisia’s next president.

His party has said it is waiting until after the presidential vote to start the process of forming a government.

The campaign has been marked by mudslinging, with Essebsi even refusing to take part in a debate with Marzouki, claiming his opponent is an “extremist”.

Marzouki first came to power with the backing of the moderate Islamist party Ennahda that ruled Tunisia after the revolution and which came second in the parliamentary vote.

It has refused to back a candidate for the presidential vote but Essebsi insists Marzouki represents the Islamists.

Marzouki in turn accuses Essebsi, who served as a senior official in previous Tunisian regimes, of wanting to restore the old guard deposed in the revolution.

He has even suggested that Essebsi’s camp was preparing to “win through fraud” in the election, drawing a sharp rebuke from Tunisia’s electoral commission.

Results are expected to be announced between December 22 and 24.

In an Internet video posted on Wednesday night, militants who joined the Islamic State group claimed the 2013 murder of two secular politicians that plunged Tunisia into crisis, warning of more killings of politicians and security forces.

Interior ministry spokesman Mohamed Ali Aroui defiantly brushed off the threat, saying “Tunisians are stronger than these terrorists. They mean nothing to us.”

The 2013 murders had threatened to derail Tunisia’s post-Arab Spring transition until a compromise government was formed in January this year.

In the video, militant Abou Mossaab called on Tunisians to boycott the polls, saying the authorities “are turning you into infidels with these elections”.

The government, which has been on alert since October, will be deploying tens of thousands of troops and police to guarantee security during the vote.

Shafik Sarsar, head of Tunisia’s electoral commission, recognised there were “possible and probable dangers” but added that this “should not change the atmosphere of the elections”.

In addition to the militant threat, major challenges remain for Tunisia.

The country’s economy is struggling to recover from the upheaval of the revolution and there are fears that widespread joblessness will cause social unrest.