[1] Lindsey became politically active and met regularly with those who were to form the Clear Grits faction in 1850, and gave voice to their views by publishing the North American with William McDougall.
He was critical of Robert Baldwin and Louis-Hippolyte Lafontaine and opposed giving in to majority French-Canadian interests, writing "we shall get no real reforms from the French".
In 1862 he published a biography of William Lyon Mackenzie, arguing the long-term positive effects of the Upper Canada Rebellion of 1837.
[1] After a series of illnesses Lindsey left editorial work in 1867 to take a sinecure as registrar of deeds for Toronto, and continued to write political articles for the Mail, the Monetary Times, and the Canadian Monthly and National Review on issues such as free trade and separation of church and state.
He died after a short illness at his son George's home on 12 April 1908 and was buried in the Mackenzie plot at the Toronto Necropolis.