Crawford stood for parliament at Harwich in 1851, where he was elected Member of Parliament when the sitting member was unseated on petition, but was himself displaced on petition because it was alleged that the poll had closed three minutes before the legal hour. In 1852 he was proposed for the City of London, but declined to become a candidate although 3765 votes had been cast for him.[2] At the 1857 general election Crawford was elected MP for the City of London. He held the seat until 1874.[3]
Crawford married Margaret Urquhart Cruikshank, daughter of the Rev. John Cruickshank, of Turriff, Scotland in 1836.[2] His sister Jane married Henry Ray Freshfield, of the family of lawyers; as Jane Freshfield she wrote travelogues of mountaineering in the Swiss Alps.
Crawford died at the age of 76 in 1889.
The caricature hangs on the fifth floor of Norman Shaw North, a building which houses many MPs. The caricature is signed by Robert Wigram Crawford himself.