Leader attached himself to the advanced wing of the Radicals, and was elected Member of Parliament for
Bridgwater in January 1835. In the House he generally acted with
George Grote and
William Molesworth of the
Philosophical Radicals, and supported the
People's Charter of 1838. In his first session he seconded Grote's resolution in favour of the
secret ballot.
John Arthur Roebuck found him a useful politician, if also frivolous. Other party friends complained that his political speeches were too bitter. In May 1837 Leader applied for the
Chiltern hundreds, in order to contest
Westminster at a bye-election against
Sir Francis Burdett. Having abandoned radical principles, Burdett had resigned the seat, and was asking his constituents to return him anew as a conservative. Leader was defeated, polling 3052 votes against 3567, but he renewed his candidature at the general election in August, when his opponent was
Sir George Murray, and he was elected by 3793 against 2620. He was re-elected in July 1841, and remained the representative of Westminster till the dissolution in 1847. He continued to advocate
Chartism and radicalism. On 2 May 1842 he seconded
Thomas Duncombe's motion "that the petitioners for the national charter be heard at the bar of the house". In the same session (18 February) he supported
Charles Pelham Villiers's motion for the
repeal of the corn laws. On 13 February 1844 he spoke in behalf of the liberties of Canada, which he joined Roebuck in championing. He was not heard in the house again. ==In society==