A former motor trader, Moloney was elected to Dáil Éireann on his first attempt, at the 1957 general election, taking his seat in the 16th Dáil. The seat had been won at the previous election for Clann na Poblachta by Johnny Connor, and retained at the by-election after Connor's death by his daughter Kathleen O'Connor, who did not stand in 1957.
The Kerry North constituency was reduced from four seats to three at the 1961 general election, and Moloney was the only outgoing TD not to be re-elected. His Fianna Fáil colleague Tom McEllistrim was returned to the 17th Dáil, the other seats going to Labour Party's Dan Spring and the independent TD Patrick Finucane.
After the loss of his Dáil seat, Moloney was elected to the 10th Seanad on the Industrial and Commercial Panel. Howevever, he died two years later, on 26 June 1963, and the by-election for his seat in the Seanad was won by John Costelloe.
- "Daniel J. Moloney". Oireachtas Members Database. Retrieved 9 September 2012.
- "Daniel J. Moloney". ElectionsIreland.org. Retrieved 9 September 2012.
- The sources are ambiguous about the name of the winner of the Seanad Industrial and Commercial Panel by-election on 28 November 1963. Oireachtas members database lists his name as "John Costello", but the record of Seanad proceedings names the new senator as "John Costelloe", and the latter spelling is also used in the record of the first Seanad division in which he voted, and in subsequent proceedings.