Lebanon's parliament is set to convene Thursday to attempt to elect a head of state for the 13th time during a presidential vacuum that's lasted over two years. The primary contenders for the presidency include the Lebanese army's commander, Joseph Aoun, who is widely seen as the preferred candidate of the United States and Saudi Arabia. The candidate previously supported by Hezbollah, Suleiman Frangieh, on Wednesday announced he was pulling out of the race and endorsed Aoun.