The 2010 presidential election was expected to be a rematch of the 2005 election between Lech Kaczyński and Donald Tusk. Since the last presidential election, Polish politics had become centered around the rivalry between Law and Justice and the Civic Platform. President Kaczyński and Prime Minister Tusk were constantly battling each other over who should represent Poland on the international stage. Tusk was leading Kaczyński in all the opinion polling (as he did in 2005 before he ultimately lost) and the election was expected to be a dirty one. However, this rematch never came to be. Donald Tusk announced in January 2010 that he will not run for President because he wants to remain Prime Minister. Lech Kaczyński was set to declare his candidacy for re-election on 23 May but he died on 10 April in the Smolensk air disaster.