Following the victory of the Law and Justice party in the
September 2005 Polish parliamentary elections, its prime ministerial candidate, party leader
Jarosław Kaczyński decided against becoming prime minister so as not to damage the chances of his twin brother,
Lech Kaczyński in the then-upcoming
October presidential election. Instead the little-known Marcinkiewicz
became PM, leading a coalition formed by Jarosław, who remained in the background, but influential. Before his prime ministerial appointment, Marcinkiewicz remained a political cipher, which resulted in a political
carte blanche after the appointment. Relatively unknown to the public at that time, due to his intensive political activity Marcinkiewicz gained a high public recognition, rapidly becoming the most trusted and popular politician in Poland. Marcinkiewicz strongly supported Polish membership in EU, although he disagreed with several more integrationist ideas, such as the
European Constitution. Economic policy of his cabinet is a continuation of those conducted by previous governments. Following speculations of a rift with
Jarosław Kaczyński, Marcinkiewicz tendered his resignation on 7 July 2006, maintaining however that no one will insert a wedge between him and Kaczyński, words he directed at
Donald Tusk. He was succeeded as prime minister by Kaczyński. == Later life ==