In February 1819 Hobhouse was the
Radical candidate at a by-election for the representation of the
City of Westminster, but he failed to secure election. He had already gained some popularity by writing in favour of reform, and in 1819 spoke the following words: "I am a man chosen for the people, by the people; and, if elected, I will do no other business than that of the people". In the same year (1819) he issued ''A defence of the People in reply to Lord Erskine's "Two Defences of the Whigs,"
followed by A trifling mistake in Thomas, Lord Erskine's recent preface''. The House of Commons declared this latter pamphlet a breach of privilege. Hobhouse was arrested for the pamphlet on 14 December 1819. In spite of an appeal to the
court of king's bench, he remained imprisoned in
Newgate Prison until the end of the following February. However this proceeding only increased his popularity, and at the
general election of 1820 he was returned for Westminster. In parliament Hobhouse proved a valuable recruit to the Reform party, and is credited with the invention of the phrase ''
His Majesty's (Loyal) Opposition'' made in 1826 during a speech in the
House of Commons. Having succeeded his father as 2nd baronet in 1831, Hobhouse was appointed
secretary at war in the
Whig administration of
Lord Grey in February 1832, and was made a
Privy Councillor. He effected some reforms and economies during his tenure of this office (he was responsible for the passing of the
Vestry Act 1831), but, unable to carry out all his wishes. Hobhouse became
Chief Secretary for Ireland in March 1833. He had only held this post for a few weeks when, in consequence of his refusal to vote with the government against the abolition of the
Doors and Windows Tax, he resigned both his office and his seat in parliament. At the subsequent election he was defeated. Hobhouse joined the cabinet as
First Commissioner of Woods and Forests when
Lord Melbourne became Prime Minister in July 1834, and about the same time Hobhouse was returned at a by-election as one of the members for
Nottingham. In Melbourne's government of 1835 he was
President of the Board of Control, in which position he strongly supported the Indian policy of
Lord Auckland. He returned to the same office in July 1846 as a member of
Lord John Russell's cabinet. In February 1851 Hobhouse went to the
House of Lords as Baron Broughton, of Broughton-de-Gyfford in the County of Wiltshire. He left office when Russell resigned in February 1852. ==Later life==