Bronisław Maria Komorowski [brɔˈɲiswaf kɔmɔˈrɔfskʲi] ( listen) (born 4 June 1952) is Polish politician and historian. He current serving as President of Poland. As Marshal of the Sejm (Speaker of Parliament), Komorowski exercised powers and duties of head of state following the death of President Lech Kaczyński in a plane crash on 10 April 2010. Komorowski was the governing Civic Platform party's candidate in the resulting 2010 presidential election, which he won in the second round of voting on 4 July 2010. He was sworn in as fulltime President on 6 August 2010. Komorowski is thus the second person to serve on two occasions as the Polish head of state since 1918 after Maciej Rataj. Rataj, however, was twice Acting President, while Komorowski first acted as President, and then became elected President.

Komorowski was the Minister of Defence from 2000 to 2001.

Bronisław Maria Komorowski was born in Oborniki Śląskie. Komorowski is the son of Count Zygmunt Leon Komorowski (1925–1992) and Jadwiga Komorowska (née Szalkowska) (1921–).

Barack Hussein Obama II (ⁱ/bəˈrɑːk huːˈseɪn oʊˈbɑːmə/; born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. In January 2005, Obama was sworn in as a U.S. Senator in the state of Illinois. He would hold this office until November 2008, when he resigned following his victory in the 2008 presidential election.

Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.

Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. Nine months later, Obama was named the 2009 Nobel Peace Prize laureate. In April 2011, he announced that he would be running for re-election in 2012.

Donald Franciszek Tusk [ˈdɔnalt franˈt​͡ɕiʂɛk ˈtusk] ( listen) (born 22 April 1957) is a Polish politician who has been Prime Minister of Poland since 2007. He was a co-founder and is chairman of the Civic Platform (Platforma Obywatelska) party.

Tusk was officially designated as Prime Minister on 9 November 2007 and took office on 16 November. His cabinet won a vote of confidence in the Sejm on 24 November 2007. He is currently the longest serving prime minister of the Third Republic of Poland. In October 2011, Tusk's Civic Platform won a plurality of seats in the Polish parliamentary election, meaning that Tusk became the first Prime Minister to be re-elected since the fall of communism in Poland.

Tusk began his public career as an activist in his home town of Gdansk, supporting Solidarity and organizing his fellow university students. With the exception of one four-year stretch, Tusk has served in the Third Republic parliament almost continuously since its first elections in 1991. He was Vice Marshal (deputy speaker) of the Senate from 1997 to 2001 and Vice Marshal of the Sejm from 2001 to 2005. He also served as Leader of the Opposition from 2003 to 2007.