SENEGAL heads to the polls on February 25 to choose a successor to President Macky Sall who is not seeking a third term. For the first time in the West African nation's history, the incumbent is not on the ballot. His handpicked successor, Prime Minister Amadou Ba, is among 20 candidates cleared by Senegal's constitutional council to run. To avoid a runoff, a candidate must secure over 50% of the vote. Campaigning starts on February 4. Following are profiles of the main contenders: PRIME MINISTER AMADOU BA A former economy and foreign minister, Ba, 62, was named prime minister in September 2022. He ran…