After the defeat in the 2005 election, in which the Social Democrats lost five seats and failed to regain the majority it had lost in the 2001 election, former Minister of Finance and party leader Mogens Lykketoft resigned his post, taking responsibility for the poor election results.
Setelah kekalahan dalam pemilu 2005, di mana Sosial Demokrat kehilangan 5 kursi dan gagal memperoleh kembali mayoritas sehingga kehilangan dalam pemilu 2001 mantan Menteri Keuangan dan kemudian-pemimpin partai Mogens Lykketoft mengundurkan diri dari posisinya di partai, mengambil tanggung jawab atas hasil pemilihan miskin.