Komorowski served as Minister of Defence from 2000 to 2001 . As Marshal of the Sejm ( Speaker of the lower house of Parliament ) , Komorowski exercised the powers and duties of head of state following the death of President Lech Kaczyński in a plane crash on 10 April 2010 . Komorowski was then the governing Civic Platform party 's candidate in the resulting presidential election , which he won in the second round of voting on 4 July 2010 . He was sworn in as President on 6 August 2010 . Komorowski thus became the second person to serve on two occasions as Polish head of state since 1918 , after Maciej Rataj . On 25 May 2015 , Komorowski conceded the presidency of Poland to the rival candidate Andrzej Duda , after the latter won the second round of the 2015 presidential election
plane crash on 10 April 2010
2010 Polish Air Force Tu-154 crash
Bronisław Komorowski