Det Radikale Venstre
When Prime Minister and Social Democrat H. C. Hansen died in February 1960 Kampmann succeeded him, creating the Cabinet of Viggo Kampmann I. H. C. Hansen had cooperated with the Danish Social Liberal Party and Retsforbundet, but Viggo Kampmann had problems working with Retsforbundet. After the 1960 Danish parliamentary election Retsforbundet failed to get into Folketinget and the Danish Social Liberal Party went from 14 to 11 mandates. But the Social Democrats gained 6 mandates to 76, and Viggo Kampmann was able to form a minority government with the Danish Social Liberal Party, the Cabinet of Viggo Kampmann II.