The FDP was so written off that survey institutes not even reported the values for the Liberals individually. But Wolfgang Kubicki believes within the “Kubicki effect.”
https://www.spiegel.de/politik/deutschland/fdp-wolfgang-kubicki-will-mit-partei-mehr-als-zehn-prozent-holen-a-5f71c992-5aab-4523-821a-495eed45a6ae#ref=rss