Jobin gradually built up an extensive notarial practice, initially with a clientele drawn from labourers and artisans, often doing agreements between masters and journeymen.

By 1820 he was averaging more than one deed a day, and had expanded his practice to include merchants, builders, and real estate speculators.

The party was regularly involved in political conflicts with the governors to obtain greater popular control of the colonial government.

Jobin attended the funerals of the three Patriotes, and assisted another justice of the peace in gathering evidence which led to the arrest of the commanding officer.

He was part of a political committee in the village which organised local support for the Ninety-Two Resolutions, passed by the Legislative Assembly in February 1834.

He was one of the speakers at a major public rally in Montreal in May 1837, and moved a resolution criticising Governor Gosford for taking coercive measures.

He was a member of the Comité Central et Permanent du District de Montréal, which directed Patriote popular opposition to the government throughout the Montreal area.

[1][3] In August 1837 Jobin resigned his recently restored commission as a justice of the peace, saying that it lacked any meaning since it had not been given to him by the people.

[1] On the outbreak of the Lower Canada Rebellion in November 1837, Jobin went into hiding, as the government began to issue warrants for the arrest of Patriote leaders and proclaimed martial law in the Montreal district.

During this time, amid rumours that the military would burn their house, his wife Émilie made efforts to preserve their assets by forced sales.

[1][4] In response to the Rebellion, the British government passed an act of Parliament, suspending the constitution of Lower Canada, and replacing it with an appointed Special Council.

[1][2][11][12][13] Two years later, in 1843, the sitting member for Montreal County, Alexandre-Maurice Delisle, resigned to take a civil service position.

Jobin was elected in time to take part in the major issue at the end of the 1843 session, when the members of the ministry led by LaFontaine and Robert Baldwin from Upper Canada resigned in protest at Governor General Metcalfe's refusal to take advice from the ministry over certain appointments.

The Legislative Assembly passed a resolution condemning the Governor General and supporting the position taken by LaFontaine and Baldwin.

Two of the leading members of the French-Canadian Group, Denis-Benjamin Viger and John Neilson, had voted against the resolution and in support of Governor Metcalfe.

An older member from Upper Canada, William Henry Draper, was also willing to join a ministry in support of Governor Metcalfe.

However, in light of the strong support shown in the Legislative Assembly for the former LaFontaine–Baldwin ministry, Governor General Metcalfe prorogued Parliament in December 1843, ultimately for almost a year.

After Elgin gave royal assent to the bill, Tories in Montreal rioted and burnt the Parliament buildings, but the principle of responsible government was firmly established.

He also supported Baldwin's bill to restrict secret societies, aimed at the Orange Order, which had a history of violent interventions in elections.

[2] In 1911, the newspaper La Patrie published an article suggesting that the colonial government had imprisoned Patriotes in the old Montreal dungeon during the aftermath of the Rebellion.

Another paper, Le Devoir, refuted the suggestion by citing the map that Jobin had drawn of the prison during his imprisonment.

[1] Almost fifty years after his death, the Revue du notariat published a retrospective series on the development of the notarial profession in Quebec.