Laois man Eoin Barry had conceded defeat after the first count.
Disabilities campaigner Tom Clonan will replace Ivana Bacik in the Seanad.
He won the Trinity College by-election last night, after the 16th count.
The security analyst got 5,358 votes - beating Maureen Gaffney by 160.
Laois Labour Party rep Eoin Barry conceded defeat after receiving 189 votes (1.4% of the poll) in the first count.
The seat became vacant when Labour's Ivana Bacik won a Dáil seat last year.
Tom Clonan says he was shocked to win:
He will be the 27th senator to represent the university since 1938.
He says his son Eoghan will be his inspiration in the Seanad:
Midlands Artists To Feature In New Wetlands Guide
Midlands Advocacy Service For Sexual Abuse Survivors Praise Victim For Getting Justice
Laois Windfarm Developer Awarded 50% Of Legal Costs
Midlands Simon Calls On Government For Retrofit Funding
Midlands Charity Calls For State Support To Help Move People Off The Streets
Offaly Singer In Semi-Final Of Glór Tíre Tonight
Fáilte Ireland Urges Off Peak Holidays As Staycation Demand Grows
Ireland Plans Charter Evacuations As Middle East Conflict Escalates
Deaf Laois Couple Face €10k Hearing Aid Bill
Pfizer Opens Midlands Applications For Apprenticeship Programme
Emergency Services Attend Scene Of Laois Crash
Bressie Adds New Dates To 2026 Irish Tour
BnM Unveils Eight Firms For 2026 Accelerate Green Programme
Westmeath County Council Urged To Buy Larger Homes For Families In Need
High Court Told Enoch Burke Transferred From Mountjoy Without Reason
Westmeath Community Launches ‘Feeling Safe Survey’
Midlands Hospital Experiencing High Admission Numbers
Retired Taxi Driver Calls For Safer Roundabouts In Laois
Laois County Council Continue Work On Rat Infestation
Laois Psychotherapist Criticises ESRI Report On School Absences