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. Mary Lou McDonald, Sinn Fein candidate for Leinster in the Euro Election on the platform at the Sinn Fein Ard Fheis at the RDS in Dublin. 28/2/2004. Photo: RollingNews.ie