Wow: If the story holds, then that was fast!
Update: Pia Christmas-Møller has posted her letter of resignation from the Conservative People’s Party on her homepage (as a pdf here) so I think we can count her as the first defection of the new Folketing.
I’m sure my politics-nerdy friends will help me out here, but if I’m not completely mistaken, then the last time a former Danish party leader has left her/his party while he/she was still an MP must be when Aksel Larsen was excluded by the Communist Party in 1958. Other possible comparisons: Knud Kristensen*), Mimi Jakobsen (is Jann Sjursen still a member of the Christian Democrats?)
The reasons behind PCM’s move: She was sidelined in the parliamentary group in September and again after the election when she was ousted as political spokesman. Personal disappointments, etc.
*) Über-nerdy point: PCM’s relative John Christmas-Møller helped bring down Knud Kristensen’s government in 1947. The Christmas-Møllers are a curious bunch.