Congolese President Felix Tshisekedi and a politician hoping to unseat him next month launched their campaigns Sunday as the incumbent leader faces ongoing violence in eastern Congo and a divided field of opposition candidates. Opposition party representatives who met in South Africa in recent days failed to unite behind a single challenger to Tshisekedi for the country's Dec. 20 presidential election. The candidates represented at the talks included Martin Fayulu, a former oil executive who lost to Thisekedi five years ago; businessman Moise Katumbi; Nobel Peace Prize winner Denis Mukwege; former Prime Minister Matata Ponyo; and Kassai legislator Delly Sesanga.