He represented Kent County in the Legislative Assembly of New Brunswick from 1843 to 1850. Wark was named to the Legislative Council in 1850 and served until Confederation. He served in the province's Executive Council as a minister without portfolio from 1858 to 1862 and as Receiver General from 1866 to 1867.
Wark was named Senator by a Royal Proclamation in 1867. Known as the "Grand Old Man of the Canadian Senate", Wark served until his death at the age of 101. At the time of his demise, Wark was the longest lived legislator in the world; he was later surpassed by another Canadian Senator, Georges-Casimir Dessaulles, who died in 1930 at the age of 102.
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