Alternative fur Deutschland supporters wave flags | Alexander Hassenstein/Getty Images German far-right AfD slumps in new poll Party has lost support, donations since last month’s ‘monument of shame’ incident.

The far-right Alternative for Germany (AfD) party hasn't been as unpopular since December 2015, according to an opinion poll for Frankfurter Allgemeine Zeitung published Wednesday.

The AfD would win 8.5 percent of the vote if an election were held now, down from an October peak of 12.5 percent.

The drop in support came in the wake of the controversy surrounding Björn Höcke, the party's leader in the state parliament of Thuringia, who last month implied Berlin’s Holocaust memorial was a “monument of shame." Local media reported Wednesday that the AfD had lost up to €100,000 in donations since Höcke's comments came to light.

The social-democrat SPD party would get 30.5 percent of the vote, a 7.5 percentage-point spike from last month. Support for the SPD has been climbing since it picked former European Parliament President Martin Schulz as its candidate for chancellor in the September election.

Chancellor Angela Merkel's center-right Christian Democratic Union would still top the ballot on 33 percent of the vote.