SF's Doherty tops by-election opinion poll
A new opinion poll shows Sinn Féin on course to win the Donegal South West by-election.
The RED C survey for Paddy Power shows Senator Pearse Doherty on 40% of first preference votes.
Fianna Fáil's Brian O'Domhnaill polls less than half that on 19%.
Fine Gael's Barry O'Neill is third on 15%, with 14% for Labour's Frank McBrearty Junior.