, 1872 As a moderate liberal he unsuccessfully contested
Cockermouth in 1835, but was successful at the following election on 15 February 1836, and continued to represent the constituency till 1 July 1852. Defeated at the general election of that date, he was returned unopposed on 28 June 1853 for
Stroud, and sat for that town till 11 November 1868. At the
1868 general election he stood unsuccessfully in
Falkirk Burghs. From 11 May 1869 to his death he was member for
Liskeard, but he had then so far separated himself from the Liberal Party that he was opposed on both occasions by more advanced members of his own partyin 1869 by Sir F. Lycett, and in 1874 by
Leonard Courtney. Early in his political career (January 1840) Horsman, when addressing his constituents at Cockermouth, denounced
James Bradshaw, M.P. for Canterbury, for speaking ill of the queen, and for secretly sympathising with the chartists. A bitter correspondence was followed by a duel at Wormwood Scrubbs, which was without serious results. Finally Bradshaw apologised. Horsman was from September to August 1841 a junior
Lord of the Treasury in
Lord Melbourne's administration. He criticised severely, and at times with personal bitterness, the ecclesiastical policy of
Lord John Russell's ministry of 1847, as being far too favourable to the bishops. A vote of censure on the
ecclesiastical commissioners was moved by him and rejected 14 December 1847. On 26 April 1850, in the discussion on the Ecclesiastical Commission Bill, Horsman smartly attacked the bishops, and roused Goulburn to denounce him as "a disappointed man" foiled of his hopes of office. In March 1855, when
Lord Palmerston became prime minister and the Peelites withdrew from the cabinet, Horsman was made
Chief Secretary for Ireland, and was sworn a member of both the British and Irish Privy Councils. He resigned the chief secretaryship after the general election in April 1857, and thenceforth assumed a more independent position in the House of Commons. With
Robert Lowe, afterwards Viscount Sherbrooke, he resisted the Reform Bill brought in by
William Ewart Gladstone in March 1866.
John Bright, speaking on the second reading (13 March 1866), ascribed Mr. Lowe's hostility to Horsman's influence, and depicted Horsman retiring 'into what may be called his political cave of Adullam, to which he invited every one who was in distress, and every one who was discontented.' According to Bright Horsman's party, to which Bright's sobriquet of the "cave" has since adhered, consisted only of himself and Mr. Lowe, but thirty-three liberal members voted against the second reading of the bill upon which the ministry was afterwards defeated in committee (18 June). Horsman maintained his independent attitude to the last. He best served the public by exposing jobs and other weak points in the ecclesiastical system. In 1841, while he was a junior lord of the treasury, he gained notoriety for attacking
Lord John Russell's ecclesiastical policy in 1847 and subsequent years. In 1855, under
Lord Palmerston, he was made
Chief Secretary for Ireland, but resigned in 1857. He gradually took up a position as an independent Liberal, and was well known for his attacks on the Church, and his exposures of various "jobs". His name became principally connected with his influence over
Robert Lowe, 1st Viscount Sherbrooke in 1866 at the time of
Gladstone's Reform Bill, to which he and Lowe were hostile; and it was in describing the Lowe-Horsman combination that
John Bright spoke of the "Cave of Adullam". In the 1867 debate on extending the franchise, he said in the House of Commons: "There is an irreconciliable enmity between democracy and freedom". ==Family==