Can a political newcomer beat two establishment candidates and change the course of the war with Russia? Ukrainians will head to the polls this weekend to select their next president. But in a tight, three-way race that has consumed a country gripped with years of war with Russia, one candidate, a political newcomer, is worrying pundits about his potential leadership. Volodymyr Zelensky, a comedian and actor who has made his name parodying the country's highest office, is a political neophyte facing off against Ukraine's nationalist incumbent, President Petro Poroshenko, and one-time prime minister, Yulia Tymoshenko. The race could decide the direction of the war with Russia and the country's relationship with the United States. NewsHour Weekend Special Correspondent Simon Ostrovsky has the story.