Your challenge if you choose to accept it is...
Make a Liberal grouping (preferably the FDP) big enough to be the senior partner in a German government. And this must be after 1945.
It's tough, but run with it if you can!
(Double points if you can do this with Austria-especially after the FPO turned to the far right! I.e. in the sense that a proper liberal grouping, like Liberal Forum, can do it)