O’Conor, who was educated as a barrister and travelled extensively in Europe in the early 1820s, supported the pro-Catholic agitation in Roscommon led by his father, the O’Conor Don, later that decade and assisted in his return for the county, following the granting of emancipation, in 1830.
He voted for the enfranchisement of Greenwich, 3 Aug. 1831, and thereafter generally divided for the details of the Grey ministry’s reintroduced reform bill. However, on 11 Aug., when he presented a petition from the burgesses of Galway complaining about its franchise, he was in minorities for printing the Waterford petition for disarming the Irish yeomanry and against the proposed division of English counties. He voted for Pelham’s amendment to adjourn the debate on issuing the Dublin writ, 8 Aug., but with government in two divisions on allegations of bribery and misconduct at the recent election there, 23 Aug. He divided for making legal provision for the Irish poor, 29 Aug., and against committing the truck bill, 12 Sept. He voted for the third reading, 19 Sept., and passage of the reform bill, 21 Sept., the second reading of the Scottish bill, 23 Sept., and Lord Ebrington’s confidence motion, 10 Oct. He spoke for the Maynooth grant, 26 Sept., and criticized the appointment of the Orangeman Lord Lorton as lord lieutenant of Roscommon, 6 Oct. 1831. The O’Conor Don, who attended a gathering of Irish Members about their reform bill in September and signed the requisition for a Roscommon reform meeting that winter, voted for the second reading of the revised reform bill, 17 Dec. 1831, to go into committee on it, 20 Jan. 1832, and again steadily for its details.
An active Member, the O’Conor Don kept his brother and agent Edward, who married his wife’s sister, closely informed of his parliamentary and constituency endeavours. In August 1832 it was feared that his exertions, especially on the subject of tithes, had impaired his health, and he possibly contemplated retreating to an English borough. However, he was returned unopposed as a Repealer at the general election that year and held his seat for the rest of his life.
