Geoghegan announced his intention to seek the Fine Gael nomination for the 2021 Dublin Bay South by-election on 30 April, noting that in the 2019 Dublin City Council election he had received the highest vote share of any Fine Gael candidate in Dublin.[10] He also stressed that he had backed Leo Varadkar in the 2017 Fine Gael leadership election.[10]
Geoghegan won the support of all 12 party branches in Dublin Bay South.[11] He was the only Fine Gael candidate to be nominated by party members as of the party deadline on 10 May, and was formally selected on 13 May.[12][13]
Geoghegan described himself as "liberal and progressive" and described housing among his three main campaign priorities.[14] He stated "I want to speak for a generation stuck in a rent trap or living in their parents' homes", and said he "is not a fan of co-living", a contrast to the Fine Gael incumbent Eoghan Murphy. When asked by journalists about his own circumstances, Geoghegan added that he had a mortgage on his home with his wife. He declined to comment on whether he had drawn on "the bank of mum and dad" for it, saying "we were lucky enough to put a deposit together" for the home.[15][16]
Following an article in The Irish Times by columnist Una Mullally criticising what the author claimed was Geoghegan's privileged family background,[17] Fine Gael requested that people focus on Geoghegan's politics. The Irish Daily Mail subsequently complained that Geoghegan was refusing to answer questions on political issues, especially Fine Gael housing policy.[17][18] Similarly, two podcasts covering Irish politics, The Echo Chamber Podcast and Una & Andrea's United Ireland podcast, complained that they had reached out to Geoghegan for interviews but he had refused all offers. Both podcasts had featured several other election candidates over the course of the campaign.[19][20]
Geoghegan received 7,052 (26.2%) first preference votes in the by-election, coming second to Labour's Ivana Bacik.
In January 2024 he was selected as a Fine Gael's candidate for the Dublin Bay South constituency at the 2024 general election.[21] He served as Lord Mayor of Dublin from June to November 2024.[3]
^Una and Andrea's United Ireland podcast (29 June 2021). "DBS Spesh #3: Neck & Neck" (Podcast). Event occurs at 10:00. Archived from the original on 9 July 2021.