The campaign in Thuringia has featured death threats, arson and Nazi rhetoric and the AfD’s candidate is Björn Höcke, who heads up the most extreme wing of Alternative for Germany (AfD).

As in other parts of east Germany, the anti-immigrant, anti-establishment party is expected to make strong gains.

But opinion surveys suggest support for the AfD has softened slightly to around 20-24 percent in the wake of the attack on October 9th, which has fuelled concern over growing right-wing threats.

Die Linke remains the most popular party in Thuringia. Graph prepared for The Local by Statista.

The AfD is vying for second place with Chancellor Angela Merkel’s CDU conservatives, with the far-left Die Linke tipped to hold onto the top spot thanks to the popularity of its local leader Bodo Ramelow.

READ ALSO: Five things to know about the AfD surge in east Germany

With a population of just over two million people and an agreement between parties not to govern with the AfD, Thuringia’s election is unlikely to cause any political earthquakes in Berlin.

But the vote is being closely watched as a snapshot of the mood in the AfD heartland after a suspected neo-Nazi shot dead two people in the eastern city of Halle.

The gunman had earlier tried and failed to storm a packed synagogue on the Jewish holy day of Yom Kippur.

The AfD’s Höcke tweeted his outrage at the assault, but immediately came under fire from critics who said his own anti-Jewish remarks had stoked hatred and violence.

Bavarian state premier Markus Söder, of Merkel’s CSU sister party, called on the AfD to expel Hoecke, who has labelled Berlin’s Holocaust memorial a “monument of shame” and called for a “180-degree shift” in Germany’s remembrance culture.

Last month Höcke, 47, stormed out of a television interview after some of his statements were likened to those of Adolf Hitler.

READ ALSO: Hitler or Höcke? Regional AfD boss cuts short German TV interview

Höcke later complained that the media have cast him as “the devil of the nation”.

But the former history teacher is controversial even in his own party as leaders fear he could scare off mainstream voters.

“The AfD would possibly do better (in Thuringia) without Björn Höcke,” professor Juergen Falter from the university of Mainz told the Bild daily.

“But he isn’t enough of a deterrent to do serious damage to the AfD.”

Höcke’s main challenger, Mike Mohring of the CDU, ramped up the rhetoric as he ruled out ever working with his AfD rival.

Mike Mohring and his CDU colleagues on the campaign trail.

“To me, Höcke is a Nazi. Others have come to the same conclusion,” he said at a town hall event in Erfurt on Wednesday, warning that Höcke’s hardline action was radicalising the AfD.

‘Hold the line’

With tensions running high on the campaign trail, police are investigating death threats against Greens co-leader Robert Habeck and the CDU’s Mohring.

Mohring said he had received messages from neo-Nazis threatening him with the same fate as pro-migrant CDU official Walter Lübcke, who was shot dead last June in a suspected far-right murder.

READ ALSO: CDU state election candidate receives second far-right death threat

“Hatred must not be allowed to win,” Mohring told Bild.

“We have to stick together and hold the line against the right and against Nazis.”

Police are also investigating an arson attack on an AfD campaign truck at the weekend, saying they “cannot rule out a political motive”.

The AfD started out as a eurosceptic outfit before reinventing itself as an anti-Islam, anti-refugee party to capitalize on anger over an influx of asylum seekers in 2015.

It is now the country’s largest opposition party in the federal parliament.

The populist message has resonated strongest with voters in Germany’s former communist east where 30 years after the fall of the Berlin Wall, resentment lingers over lower wages and fewer job opportunities.

In regional elections in the eastern states of Saxony and Brandenburg last month, the AfD surged to become the second-largest force.

In both instances, the mainstream parties kept a pact not to enter into government with the AfD.