Far-right AfD on verge of first mayoral win in Germany

The far-right AfD party's candidate leads polls for mayor in the town of Nordhausen, located in Thuringia state.
Mainstream parties hope to block the AfD victory by urging voters to support the incumbent mayor.
AfD polls at 21.5% nationally but even higher in Thuringia, at around 32%.
The AfD candidate has made controversial statements about Germany's Nazi past.
Nordhausen has historical significance relating to the Holocaust.