 The "Vereinigte Landtag" of 1847 (an assembly of the members of Prussia's provincial legislatures) gave him an opportunity to demonstrate his parliamentary skills, whereupon Manteuffel showed himself a champion of the bureaucratic political system and an opponent of constitutional liberalism.On November 8, 1848, Manteuffel entered the cabinet of Friedrich Wilhelm, Count Brandenburg, receiving the portfolio of the Ministry of the Interior.For the next ten years, he held various positions in the government and was high in the favor of King Friedrich Wilhelm IV.