In 1841 he was returned M.P. for the county of Argyll without a contest. He entered Parliament as a Liberal Conservative, and so attracted the notice of Sir Robert Peel as to be offered by him a subordinate place under Government; but Campbell felt it better to be free from party control, and declined the appointment. At this period, in addition to his strong ecclesiastical convictions, he held free trade principles, and was a supporter of vote by ballot, both of which he insisted would prove truly Conservative measures. His first speech in the House of Commons on Scottish Church matters was delivered in March 1842, in the debate on
Andrew Leith Hay's motion as to the exercise of crown patronage in the case of Elgin, a speech which again drew forth the praise of Dr Chalmers, who, at the same time, urged him to push his proposed motion that the House should appoint a committee of its members to inquire into the Church's claims. This motion he did bring forward soon thereafter, and pled the expediency of such a step with great force of argument; but the motion was lost by 139 to 62. These Parliamentary appearances so commended him to the Church Defence Committee in Scotland, that, after the Duke of Argyll's Bill was coldly received in the House of Lords, Mr Campbell was requested to introduce a similar bill into the House of Commons. Acceding heartily to this request, he, on 14 April 1842, brought in a "Bill to regulate the exercise of Church Patronage in Scotland." Though not granting the anti-patronage claims which the Church regarded as the best settlement, it is said that it would have saved both the rights of the people and the Church's spiritual independence, and thus have prevented the secession of next year. When the order of the day for its second reading was moved in the beginning of May,
Sir James Graham, on the part of Government, requested Mr Campbell to postpone the second reading for six weeks, as Government intended to propose a course which would put an end to the collision between the Church and the civil courts. Mr Campbell consented to this, with the distinct proviso, that, should the Government measure prove unsatisfactory, he would that day six weeks proceed with the second reading of his own Bill; but
Mr Fox Maule, intimating his hopelessness of any proper measure from Government, moved "That the Bill be now read a second time," and, after some debate, Mr Maule's amendment was lost by 131 to 48. Thus ended what was called "Monzie's Bill." Sir James Graham's pledge was never fulfilled, for Government did nothing. Most people now saw — and none more plainly than Mr Campbell— that a Disruption was imminent. In the prospect of this, a Convocation of ministers was held in Edinburgh, followed by active arrangements throughout many congregations in Scotland in preparation for the event. The rejection of Fox Maule's motion by the House of Commons in the spring of 1843 rendered the Disruption so certain, that Mr Campbell left London for a time, and at once set about the building of a wooden church for his residential parish of Monzie. This was quickly finished at his own expense, while he purchased a church which was for sale in
Crieff, and presented it to the Free Church congregation there. After delivering several earnest speeches in Scotland on the impending crisis, he resumed for a time his place in Parliament, and wrote what has been called "a solemn letter to
Sir Robert Peel, imploring him even at the eleventh hour to avert the breaking up of the Church, by instantaneous and satisfactory legislative interposition." All in vain. The General Assembly met. Mr Campbell, as a representative elder, was present; and after
Dr Welsh had read the Protest, bowed to the Lord High Commissioner, and stepped down from the chair, Dr Chalmers took Mr Campbell's arm, saying, "Come away now, Monzie," and the two walked together down to the Canonmills Hall, where the first
Free Church General Assembly was constituted. Before the sessions of that Assembly were concluded, Mr Campbell returned to London, to make final arrangements for retiring from Parliament; but the Assembly, on 30 of May, passed a cordial vote of thanks to him for his services, which was communicated to him by a much-prized letter under Dr Chalmers' own hand. On the very day of the Disruption, Mr Campbell wrote a circular to the Argyllshire constituency, intimating his resolution to resign his position as their representative, having felt constrained in conscience to differ widely from many of those who had originally elected him. Being thus, as it were, set free from other influences, he devoted himself to promote the interests of the
Free Church, the object 'nearest and dearest to his heart." ==Work for the Free Church==