Smith, a member of the prominent Whig banking dynasty, was returned for the family borough of Midhurst in 1831, thus joining his father and brother in the Commons. He divided for the second reading of the Grey ministry’s reintroduced reform bill, 6 July, and steadily for its details, though he was in the minority for the total disfranchisement of Aldborough, 14 Sept. 1831. He voted for the bill’s passage, 21 Sept., the second reading of the Scottish bill, 23 Sept., and Lord Ebrington’s confidence motion, 10 Oct. He voted to punish only those guilty of bribery at the Dublin election and against the motion censuring the conduct of the Irish administration, 23 Aug. He divided for the second reading of the revised reform bill, 17 Dec. 1831, and for its details. Although The Times credited ‘Mr. M. Smith’ with a speech in defence of the transfer of Midhurst from schedule A to B, 23 Feb., this was probably delivered by his cousin and colleague George Robert Smith.
With the demise of his father’s interest at Midhurst, Smith had to wait 15 years before being returned for Chipping Wycombe with the support of his cousin, the 2nd Baron Carrington, as a free trader opposed to the ballot. As a politician, he was always overshadowed by his brother.
