Electoral system for the president

http://aceproject.org/ero-en/regions/africa/SD/sudan-electoral-law-2008/view Electoral Act, 2008-07-15 Article 26. (1) The President of the Republic or the President of the Government of Southern Sudan shall be elected by a voter who shall cast one vote for one candidate to the office of the President of the Republic or the President of the Government of Southern Sudan. A candidate shall be declared elected if he or she obtains fifty percent of the valid votes plus one vote or more, in accordance with Article 54 of the Constitution or Article 99 of the Interim Southern Sudan Constitution 2005, as the case may be. (2) In circumstances where no candidate according to sub-section (1) has secured the required number of votes, the Commission shall conduct election between the two candidates who obtained the highest number of valid votes within sixty days of the polling day. The candidate who obtains the highest number of votes shall be declared elected.