Many Franco-Manitobans shifted away from the Conservative Party after the end of World War I. Boivin was returned as an independent candidate in the 1920 provincial election, and subsequently affiliated himself with the United Farmers of Manitoba (UFM).
Boivin served as a backbench supporter of John Bracken's administration, and was re-elected as a pro-government independent candidate in the elections of 1927 and 1932.
This alliance was made permanent after the election, though it did not always prevent Liberals and Progressives from running against one another in specific constituencies.
Again campaigning as a pro-government independent candidate, Boivin challenged Lamont in the 1941 provincial election and won without difficulty.
Though he still supported the Liberal-Progressive government,[3] Boivin sometimes sided with the small opposition caucus in legislative debates after 1941.