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, to succeed Gerry Adams, in February 2018. End. 25/5/2007. General Election 2007 Count. Sinn Fein candidate for Dublin Central Mary Lou McDonald with party president Gerry Adams during the General Election count 2007 in the RDS Dublin. Pic. Albert Gonzalez /RollingNews.ie