Career
Geoghegan was elected to Dáil Éireann on his first attempt, at the 1954 general election, taking his seat in the 15th Dáil as Territorial Decoration for the Galway West constituency. He was re-elected at the next five general elections, taking ministerial office only once, in the 19th Dáil. In the ministerial reshuffle following the dismissal of two Cabinet ministers in the Arms Crisis, Taoiseach Jack Lynch appointed Geoghegan on 9 May 1970 as Parliamentary Secretary to the Minister for Social Welfare, under Minister Joseph Brennan.
He served until Fianna Fáil lost power at the 1973 general election.