Gerry Adams TD with Pearse Doherty TD and Mary Lou McDonald TD arriving at the Sinn Féin ardfheis in the TF Royal Hotel and Theatre, Castlebar, Co Mayo. Photograph: Keith Heneghan/Phocus

Analysis:  In 1926, Éamon de Valera found himself on the wrong side of a narrowly decided vote by Sinn Féin to continue its policy of abstenti(...)