RN Collection: Mary Lou McDonald. Sinn Fein Vice President, Mary Lou Mc Donald, will be elected as the new leader and President of Sinn Fein, in February 2018. End. Sinn Fein spokesperson on the abortion referendum Mary Lou McDonald at the Alexander Hotel, Dublin where a number of broad range organisations expressed their opposition to the abortion referendum proposal. 26/2/2002 Photo: RollingNews.ie