[2] 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.

Marcinkiewicz strongly supported Polish membership in EU, although he disagreed with several more integrationist ideas, such as the European Constitution.

[7] On 18 July Marcinkiewicz was appointed as the temporary acting mayor of Warsaw, a so-called "comissar".

He could not answer simple questions asked by Warsaw based English native speakers hired by one of the Polish tabloid who called him to offer a job in other bank in UK.

after the success in negotiations of the EU budget on 17 December 2005,[17][18] – the phrase that has entered into the Polish popular culture as a symbol of a political success 'with a human face' (not refraining from real emotions),[19] but at the same time as a symbol of untempered self-confidence.