(CNN) -- Poland holds a runoff election Sunday after no clear winner emerged in a June race for the presidency.
The election is to replace Lech Kaczynski, who was killed in a plane crash in April along with numbers of Poland's political and military leadership.
Though the president in Poland is primarily a ceremonial figure, he has the power to veto laws, thus helping to shape politics.
Polling takes place until 8 p.m. (2 p.m. ET), but no clear results are expected until Monday morning.
In the June election, Bronislaw Komorowski -- the parliament speaker who has been acting president since the crash -- failed to garner more than 50 percent of the vote, which would have clinched victory.
The runoff pits him against Kaczynski's twin brother, Jaroslaw Kaczynski.
The two were among 10 candidates in the election originally planned for the autumn but brought forward after Kaczynski died.
Jaroslaw Kaczynski, once prime minister, is a divisive figure in Polish politics. His far-right Law and Justice party is running on a nationalist platform with the slogan, "Poland comes first".
"Poland has to be a strong country, otherwise it will not exist," he said recently. "I want to tell everyone here that as president I won't just be the head of state -- I will look after the strength of the Polish nation".
Komorowski is a moderate running for the center-right Civic Platform.
"We have been on this road for 21 years together, and we have been right," Komorowski said on the campaign trail. "We have been moving toward democracy and navigating our way in a free economy".
The president, his wife and more than 90 others were killed April 10 in western Russia on their way to a service commemorating the 70th anniversary of the Russian massacre of Polish prisoners of war in the village of Katyn.
