Sinn Féin invested considerable resources in their campaign, placing advertisements in almost 50 northern newspapers making a range of arguments against partition. Sinn Féin also published its own newspaper,
The Unionist, of which 50,000 copies were sent to prominent Protestants in East Ulster, particularly
County Antrim. In particular, Sinn Féin claimed there was widespread ignorance over the situation in Ulster and warned against the economic dangers of partition, particularly in relation to threats of a renewed boycott against northern goods in a manner similar to the "Belfast Boycott". Sinn Féin also attempted to attract Ulster's rural and agricultural workers, arguing partition would put them at the mercy of eastern Ulster's urban elites. Despite the scale and organisation of the campaign, its arguments failed to resonate with voters, with the party's chief organiser
Eamon Donnelly claiming on the day of the election that all Sinn Féin's efforts had achieved was assuring a high Unionist turnout. Sinn Féin treated the two elections north and south as
combined elections to the Second Dáil. Five of the six successful Sinn Féin candidates in Northern Ireland were also elected for constituencies in Southern Ireland;
Seán O'Mahony was the only Sinn Féin success solely elected in Northern Ireland. ==Results==