What went wrong? Let's see:
The coalition consisted of:
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SocDems ("red" liberals)
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Greens ("green" liberals)
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Liberals (liberals)
Also in the Parliament as the opposition are:
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Conservatives (liberals)
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The "Left" (weird liberals, very slightly progressive)
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Cult of personality party (very weird liberals)
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The blue DEUTSCHLAND party (more openly fascistic liberals)
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Some independents (probably liberals)
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One confused half Danish person nobody knows how they got there (liberals)
Any questions?
Stefan Seidler is from the SSW (South Schleswig Voters' Association), a small party representing the Danish and Frisian minorities in the northernmost federal state in Germany, Schleswig-Holstein. They are exempted from the 5% vote requirement, but rather unremarkable otherwise, politically mostly aligned with the Nordic model (free markets with welfare).
It was kinda funny when they actually got enough votes at the federal elections to get into Berlin. There were some memes about it.