Jaros?aw Aleksander Kaczy?ski, which he cofounded in 2001. He has been the leader of the opposition since the 2007 elections. He has a Doctor of Law degree. He is the identical twin brother of the former Polish President Lech Kaczy?ski. After the 2007 electoral defeat of PiS, Kaczy?ski stepped down from office as Prime Minister following the first meeting of the new Sejm. He ran against Bronis?aw Komorowski in the Polish presidential election on 20 June 2010, which were called following the death of Lech Kaczy?ski. Kaczy?ski announced his candidacy on 26 April 2010, and said he would take the place of his recently deceased brother. He received 36.46% of votes in the first round, while acting president Bronis?aw Komorowski received 41.54%. In the second round, against Komorowski, he was defeated?receiving 46.99% of the votes, while Komorowski received 53.01% and won. 

June 18th, 1949 in Warsaw (Age 75)