Campbell, as a young lawyer, ‘knew necessity’ and ‘squeezed with difficulty’ 150 guineas from his patrimony to make a continental tour with his life-long friend Robert Murray Keith
On good terms with Bute and Stuart Mackenzie, he soon made his mark as a Government speaker; opposed, 11 Dec. 1761, the motion for Spanish papers; seconded the Address on the war with Spain, 19 Jan. 1762, ‘very handsomely both as to style and matter’;
He spoke 10 Dec. 1762 in favour of the Peace;
Lord Frederick was sensible, shrewd, and selfish; and on this and a subsequent crisis showed that no connexion or obligation could stand against the eagerness with which he pursued immediate fortune. Nothing else weighed with him, except the inveteracy of national prejudice. As Mr. Conway had acted in opposition to Scottish measures, Lord Frederick, forgetting Mr. Conway’s friendship and kindness and his own youthful situation, and borne away by a hot temper, often and indecently attacked him in Parliament, though without any brilliancy of parts to colour over such improper behaviour.
He opposed, 29 Jan. 1765, Sir William Meredith’s motion on general warrants, and, 5 Mar., Calvert’s motion for restraining the powers of the attorney-general; spoke 15 Feb. against receiving colonial petitions against the Stamp Act; and on the Regency question on 9 May favoured leaving the choice of regent to the King.
On 23 May, Grenville, having forced the King to agree to Smart Mackenzie’s dismissal, nominated Lord Frederick to the office of lord privy seal (which Lorne had declined in his brother’s favour) together with the management of Scotland ‘under certain limitations ... but without access to the Closet’.
In the new session he spoke
Nothing should at present have made me solicit this troublesome office, with all its advantages, but, finding it handsomely and heartily offered, I thought I owed it to myself not to decline service.
His services were rewarded in 1768 by the office of lord clerk register.
Henceforth he voted consistently with Administration. On 28 Nov. 1772 he was elected to the secret committee on East India affairs, but declined the chairmanship. Possessed of a lucrative office and a fine estate, Lord Frederick now had less incentive to distinguish himself in Parliament and rarely spoke. A member of a social group, ‘the Gang’, which included Henry Drummond, Richard Rigby, Thomas Bradshaw, and Thomas Harley he preferred retirement at Coombe Bank, and maintained a certain detachment in controversial issues. Deploring North’s vacillation and the Cabinet’s divided views in the heated debate of 10 May 1773
For financial reasons Campbell in autumn 1776 decided to reduce his London establishment and attend Parliament only some two days per week.
In 1780, Campbell, in ill health and tired of the burden of representing Glasgow Burghs, decided to seek a county constituency. Certain of return for Argyllshire, he also stood for Dunbartonshire where the Argyll interest was seriously threatened. After a violent contest he was returned, but did not seriously contest the petition which George Keith Elphinstone brought against him.
As Member for Argyll he could now indulge his ‘idleness’.
Listed ‘hopeful’ by Robinson in early January 1784, he spoke 12 Jan. in favour of considering Pitt’s East India bill: ‘He had voted for the other bill but whichever bill appeared to him to be the best ... by that he would abide.’
Wraxall describes him in 1785:
Lord Frederick ... still retained all the graces he had inherited from his mother. His figure united symmetry with elegance, and his manners, noble yet soft, dignified yet devoid of any pride or affectation, conciliated all who approached him. Devoid of shining talents, he nevertheless wanted not either ability or eloquence in a certain degree, both which were under the control of reason and temper.
He died 8 June 1816.
