During much of the time that Macaulay had continued writing his reviews, at the rate of about two in a year, he was an active member of Parliament, frequently addressing the House of Commons, and earning the gratitude of the country by his liberal and enlightened views,—especially those in reference to the right of Unitarians to their chapels, to the enlarged money-grant given to the Irish Roman Catholic Maynooth College, and to the extension of copyrights. He rarely spoke without careful preparation. His speeches were forcible and fine. In the higher field of debate, however, as we have already intimated, he was not successful. In 1845 Sir Robert Peel retired, the Whigs again coming into power; and in 1846 Macaulay accepted the office of Paymaster of the Forces, because its duties were comparatively light and would not much interfere with his literary labors, while it added L2000 a year to his income. During the session of 1846 and 1847, while still in Parliament, he spoke only five times, although the House was ever ready to listen to him.
In the year 1847 the disruption of the Scotch Church was effected, and in the bitterness engendered by that movement Macaulay lost his popularity with his Edinburgh constituents. He seemed indifferent to their affairs; he answered their letters irregularly and with almost contemptuous brevity. He had no sympathy with the radicals who at that time controlled a large number of votes, and he refused to contribute towards electioneering expenses. Above all, he was absorbed in his History, and had lost much of his interest in politics. In consequence he failed to be re-elected, and not unwillingly retired to private life.