Bulgarian presidential election, 2016 Bulgarians head to the polls in a presidential runoff between BSP backed Rumen Radev, of the socialist opposition, and Tsetska Tsacheva, Chairwoman of the National Assembly, from incumbent prime-minister Boyko Borisov's conservative GERB. Exit polls by Alpha Research and Gallup International show Radev with about 58 percent of the vote with Tsacheva getting around 35 percent. Sources: Reuters novinite.com