Samuelson unsuccessfully contested the 1885 general election in the Tewkesbury division of Gloucestershire. He was unsuccessful again at the 1886 general election in the Frome division of Somerset, where he was defeated by the Conservative candidate in what had been a Liberal-held seat.
He entered Parliament the following year, when he was elected at by-election in July 1887 as the Member of Parliament (MP) for the Forest of Dean, following the resignation of the Liberal MP Thomas Blake.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "F"
- Craig, F. W. S. (1983) . British parliamentary election results 1885–1918 (2nd ed.). Chichester: Parliamentary Research Services. pp. 284, 286, 379. ISBN 0-900178-27-2.
- Hansard 1803–2005: contributions in Parliament by Godfrey Samuelson