One decisive factor is N’dour’s shaky relationship to traditional Sufi religious authorities who have some sway in electoral politics. (Wade is very deferential to them.) In the past N’dour has riled them. In the most famous case, in 2004 N’dour recorded an album, “Egypt,” of Sufi Islamic praise music with the Egyptian national orchestra. The album won him a Grammy, but it was controversial in Senegal. (The album controversy forms the heart of the 2008 documentary “I Bring What I Love” — including objections by some Senegalese that the filmmakers film holy sites and religious rituals.) I wonder if N’dour has lived that down.