CDU mayor backs AfD in Saxony-Anhalt election as firewall crumbles

A Christian Democratic mayor in Saxony-Anhalt has broken the most durable taboo in post-war German politics. Bernd Prange, who leads the town of Altmärkische Höhe, announced on Wednesday that he had donated €10,000 to the Alternative for Germany and would vote for the far-right party in the state election on 6 September. His goal, he wrote in an open letter, is for the AfD to win an absolute majority so that his own party finally tears down the Brandmauer, the firewall against cooperation with the far right.

The episode lands at the worst possible moment for Friedrich Merz. The Chancellor has staked his authority on holding the line against the AfD, insisting that no CDU politician at any level will govern with, rely on, or tolerate the far right. Yet in Saxony-Anhalt, the AfD is polling between 41 and 43 percent, almost twice the CDU's 22 to 24 percent. If those numbers hold, the far right could form a single-party government in a German state for the first time since 1945.

A calculated provocation from inside the house

Prange is not a fringe figure. He has been a CDU member for decades, holds elected office, and until this week sat comfortably within the party's mainstream in a region where the CDU has long dominated local government. His letter reads less like a defection than a hostage note addressed to the federal leadership. He accuses Merz of running a party that is "giving up the conservative core of the Union" and demands the Chancellor's removal. The €10,000 donation, modest by political financing standards but symbolically potent, was transferred to the AfD's Saxony-Anhalt branch last month, according to party filings seen by reporters.

The mayor's language is deliberate. He does not ask the CDU to cooperate with the AfD; he wants the AfD to govern alone so that the CDU is forced to confront its own irrelevance. "I want the AfD to become so strong in the Saxony-Anhalt election that it can govern alone," he wrote. "Only then will the CDU finally wake up." That logic, destroy the party to save it, has circulated in CDU backrooms for years. Prange has simply said it aloud.

Schulze's dilemma: discipline or denial

Sven Schulze, the CDU Ministerpräsident of Saxony-Anhalt since 2021, responded on Thursday with the careful irritation of a man who knows he cannot win. "I don't like it. I can say that very clearly," he told the Berlin Playbook podcast. "I think his approach is wrong. Definitely." Asked whether Prange would remain a Christian Democrat, Schulze deferred: "We'll deal with the issue after the election. Right now, it's campaign time."

The hesitation is tactical. Expelling a sitting mayor weeks before a vote would hand the AfD a martyr and confirm its narrative that the CDU silences dissent. Doing nothing, however, signals that the firewall is porous at the very level, local government, where the AfD has made its deepest inroads. Schulze's own position is fragile. His coalition with the SPD and FDP holds a wafer-thin majority in the Magdeburg Landtag. Every percentage point the CDU loses to the AfD makes post-election arithmetic harder.

The eastern firewall was always thinner

The Brandmauer was never as solid in the east as Berlin liked to believe. In 2020, the CDU in Thuringia voted with AfD support to install Thomas Kemmerich as Ministerpräsident, a episode that collapsed in three days but shattered the illusion of unity. Since then, CDU district councils in Saxony, Brandenburg and Saxony-Anhalt have repeatedly cooperated with AfD deputies on planning, school and budget motions, usually quietly, always denied.

What makes Prange different is the scale and the timing. He is not a backbench councillor trading votes on a swimming pool renovation. He is a mayor endorsing an AfD absolute majority in a state election that begins in sixteen days. The donation creates a paper trail that party discipline procedures cannot ignore. Under CDU statutes, members who "support" another party can be expelled. The federal party's arbitration court has precedent: in 2023 it upheld the expulsion of a Bavarian district councillor who appeared at an AfD event.

Merz's shrinking room for manoeuvre

For Merz, the Prange case is a symptom of a structural problem he inherited and has not solved. The CDU's eastern vote share has halved since 2013, while the AfD has consolidated a base that is younger, more male, and more working-class than the CDU's aging electorate. In Saxony-Anhalt, the AfD leads among voters under 45 by a margin of nearly two to one. The CDU's traditional coalition partners, the FDP and the Free Voters, are polling below the five percent threshold, leaving no arithmetic path to a non-AfD majority.

Merz has ruled out any cooperation with the AfD at federal level, a position he reiterated in a ZDF interview last Sunday. But the firewall is a federal construct. State parties are legally independent associations. If the Saxony-Anhalt CDU decides after 6 September that a minority government tolerated by the AfD is preferable to new elections, Merz has no formal mechanism to stop them, only the moral authority he is currently spending down.

Three elections, one test

The Saxony-Anhalt vote is the first of three eastern tests in September. Berlin votes on 20 September, where the AfD is polling around 18 percent and the CDU leads at 28 percent, but a repeat of the 2021 coalition chaos is likely. Mecklenburg-Western Pomerania votes the same day, with the AfD at 30 percent and the SPD incumbent Manuela Schwesig fighting to hold her majority. All three states have CDU leaders who have sworn the firewall oath. All three face arithmetic that may require AfD toleration to govern.

The federal party has tried to insulate itself. In January, the CDU presidium passed a resolution tightening the firewall: any local cooperation with the AfD must be reported to the federal executive, and violations can trigger party exclusion proceedings. But the resolution left "toleration", a minority government surviving because the AfD abstains, in a grey zone. That ambiguity is where Prange operates.

The money trail and the membership card

Prange's €10,000 donation is legally unremarkable. German party law permits donations from individuals up to €50,000 per year without immediate publication; amounts above €10,000 are reported in the Bundestag's annual reimbursement report with a one-year lag. The AfD will declare it in its 2026 accounts. What matters is the signal. A CDU officeholder giving five-figure sums to the far right while holding a mandate from the CDU is without precedent in the party's 77-year history.

Party insiders in Magdeburg say Prange has been vocal in internal chats for months, criticising Merz's migration policy, the heating law compromise with the Greens, and the CDU's abstention on the EU supply chain directive. He is not alone. A survey of CDU local chairs in Saxony-Anhalt conducted by the Konrad Adenauer Foundation in June found 34 percent believed the firewall was "no longer sustainable" in its current form. Only 12 percent supported formal cooperation with the AfD, but 41 percent said "toleration" of a minority government should be discussed.

What the AfD makes of its new donor

The AfD's Saxony-Anhalt leader, Martin Reichardt, has welcomed Prange's endorsement with restrained glee. "It shows that even in the CDU, people recognise that we are the only conservative alternative," he told the Magdeburger Volksstimme. The party's federal leadership, mindful of the Bundestag's surveillance by the domestic intelligence agency, has been quieter. Alice Weidel and Tino Chrupalla have not commented directly, but AfD social media channels have amplified Prange's letter to their 1.2 million followers across platforms.

For the AfD, the donation is worth far more than €10,000. It validates the party's central claim: that the CDU's firewall is a Berlin construct imposed on unwilling eastern members. Every CDU defector, and Prange will not be the last, becomes a campaign asset in regions where the AfD presents itself as the true heir to the CDU's pre-Merkel conservatism.

The week after the vote

Schulze's promise to "deal with the issue after the election" sets a deadline. If the AfD wins an absolute majority on 6 September, still a big if, given the volatility of eastern polls, Prange will claim vindication. The CDU federal executive will face a choice: expel a mayor who delivered the result he predicted, or accept that the firewall has a price tag. If the AfD falls short but becomes the largest party, the toleration question becomes immediate. The CDU in Magdeburg would need AfD abstentions to elect a Ministerpräsident or pass a budget.

Merz has a narrower window than he admits. The federal CDU party conference in November was meant to be a showcase for his leadership. If three eastern state elections produce three AfD first-place finishes, the conference becomes a referendum on the firewall. The Chancellor's allies are already preparing a resolution reaffirming the ban on cooperation, but resolutions do not bind state associations. The only enforcement is political pressure. Prange has just demonstrated how little that pressure weighs.

The €10,000 has been spent. The letter has been published. The firewall, which has held for 77 years, now has a hole in it the size of a mayor's conviction. What happens in Saxony-Anhalt on 6 September will tell us whether the hole can be patched, or whether the whole structure was always more fragile than Berlin wanted to believe.

For context on Saxony-Anhalt's demographic and economic profile, see Destatis data on the state.