On Sunday, voters in Poland will cast ballots in a highly charged, high-stakes election for president. The two frontrunners are current President Andrzej Duda, an ultra-conservative ally of the ruling Law and Justice (PiS) party, and Rafal Trzaskowski, the liberal mayor of Warsaw.
If none of the five candidates wins 50 percent of votes, Sunday's top two vote-getters will face off in a second round on July 12.
There are two reasons why the results will be studied across Europe and beyond. First, it's a referendum on a populist government, in power since 2015, which has pushed Poland into conflict with the European Union.