Remembered as ‘a sound lawyer, and a fair and zealous though not an impassioned advocate’ who ‘possessed a calm temper and a dignified bearing’, Atherton entered Parliament in 1852 as an ‘advanced Liberal’ and served as solicitor-general and attorney-general in Palmerston’s second administration.
At the 1852 general election Atherton offered for Durham city where, after a bitter campaign, he was returned in second place by a margin of just four votes. Two petitions against his return, 23 Nov. and 25 Nov. 1852, were subsequently withdrawn, 26 Nov. 1852, but a select committee appointed to inquire into the circumstance of the withdrawals reported that Atherton’s own agent had got up the 25 Nov. petition in order to delay the issuing of a new writ for Durham city (necessitated by the death of Atherton’s colleague three weeks after their return), in order to induce the withdrawal of the original petition.
A frequent attender, Atherton voted against Disraeli’s budget, 16 Dec. 1852, and during Aberdeen’s coalition, divided against the repeal of the Maynooth grant, 23 Feb. 1853, and for the ballot, 14 June 1853. He backed Roebuck’s motion of inquiry into the condition of the army, 29 Jan. 1855, and thereafter supported the foreign policy of Palmerston’s first ministry, voting against Disraeli’s critical motion on the prosecution of the war, 25 May 1855, and pairing off against Cobden’s censure motion on Canton, 3 Mar. 1857. Elected without opposition at the 1857 and 1859 general elections, he remained loyal to Palmerston, backing his conspiracy to murder bill, 19 Feb. 1858, the defeat of which precipitated the collapse of his government, and supporting his second administration on most major issues. A champion of suffrage extension, he was in minorities for the county franchise bill, 13 Mar. 1861, and for the borough franchise bill, 10 Apr. 1861.
Although Atherton consistently voted for the abolition of church rates throughout his parliamentary career, he believed that an alliance between Churchmen and Wesleyans was critical for the success of Britain’s domestic politics.
The vast majority of Atherton’s reported speeches in the Commons addressed legal matters, particularly his desire to reform land and inheritance law. His contributions to the debate on proposed changes to the law of mortmain displayed a mastery of detail, 28 June 1854, and the following year he was given leave to introduce a bill to remove restrictions on the conveyance of land for charitable uses, 15 May 1855. The bill was rejected by the Lords, however, and his subsequent charitable uses bill, which proposed the same removal of restrictions, 9 June 1857, suffered the same fate. Atherton also pressed for reform of the legal system itself. In his first known speech, he backed the judges’ exclusion bill, insisting that the efficiency of superior judges would ‘be impaired by their being eligible to a seat in Parliament’, 13 Apr. 1853, and during a debate on the common law procedure bill, he strongly supported the clause to discharge a jury after twelve hours if they could not agree, arguing that Britain should ‘no longer have to witness the spectacle of jurors being starved into unanimity by the dogged obstinacy of stout men in top-boots’, 29 June 1854. However, for some MPs, Atherton’s reformist instincts were insufficient. For example, when he spoke in opposition to Sir John Trelawny’s motion to introduce an affirmations bill to extend Scotch criminal law to the 1854 Criminal Procedure Act, 11 Mar. 1863, Trelawny noted in his diary that Atherton ‘has not breadth of views enough for a law Reformer’.
Atherton was judge-advocate of the fleet and standing counsel to the admiralty from 1855 until 1859, when he became solicitor-general and subsequently received a knighthood. He succeeded to the post of attorney-general in June 1861 following the elevation of Sir Richard Bethell to the lord chancellorship, and was the first Methodist to hold the position.
As attorney-general during the early part of the American civil war, Atherton’s brief tenure was a difficult one. In November 1861 the boarding of the Trent, a British mail steamer, by a Union captain who proceeded to remove two Confederate diplomats on board sparked a crisis in relations between the United States and Britain.
Atherton’s competency as attorney-general was also posthumously called into question. One line of inquiry during the 1872 Geneva Tribunal Arbitration, which investigated whether the British government had violated neutrality by allowing the Alabama, a future Confederate raider, to be built in Birkenhead, was why Russell only received Atherton’s legal opinion concerning whether the Alabama should be seized after the vessel had already departed.
The strain of office, however, took its toll on Atherton and in September 1863 he resigned as attorney-general on account of ill health.
