Sinn Féin's president was speaking at the Ploughing today in Offaly.
Mary-Lou McDonald says Sinn Féin's participation in the presidential election will be a 'gamechanger'.
Speaking at the Ploughing today in Offaly, the party leader refused to reveal any details of the chosen candidate, with an official announcement due on Saturday.
It comes as the three confirmed candidates have spent the past three days speaking to crowds at the event and canvassing for votes.
Mary-Lou McDonald denies Sinn Féin missed an opportunity to get its candidate out and about this week:
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