A half-pay captain, Campbell was brought into Parliament by Argyll,
Although he was re-elected in 176I as a Government supporter,
In December 1763 he vacated his seat on being given the sinecure of master of the revels. On his death, 30 Dec. 1764, his widow, ‘through the interest of her husband’s relations’, received a pension of £200 p.a., half of which she allocated to the payment of his debts.
