Mauger served as the member for Melbourne Ports from 1901 to 1906.
At the 1906 federal election, Mauger contested the newly created seat of Maribyrnong and became the electorate's first Federal Member of Parliament.
He was a Minister without a Portfolio from 1906 until 1907 and then Postmaster-General until 1908.
Mauger lost his seat of Maribyrnong to ALP candidate James Fenton in 1910.

Mauger ran for the Senate in 1913 and 1914, but failed to get elected.
He was an ardent protectionist and was for some time honorary secretary of the protectionists' association of Victoria; he was for a time president of the Melbourne Total Abstinence Society, and chairman of the Indeterminate Sentences Board; and he presumably found some time for his business as a hatter and mercer.
For about 50 years in every movement in Melbourne intended to better the conditions of the mass of the people, Mauger was to be found working incessantly and showing much organizing ability.
Mauger served as the member for Melbourne Ports from 1901 to 1906. At the 1906 federal election, Mauger contested the newly created seat of Maribyrnong and became the electorate's first Federal Member of Parliament. He was a Minister without a Portfolio from 1906 until 1907 and then Postmaster-General until 1908. Mauger lost his seat of Maribyrnong to ALP candidate James Fenton in 1910.
Mauger ran for the Senate in 1913 and 1914, but failed to get elected. He was an ardent protectionist and was for some time honorary secretary of the protectionists' association of Victoria; he was for a time president of the Melbourne Total Abstinence Society, and chairman of the Indeterminate Sentences Board; and he presumably found some time for his business as a hatter and mercer. For about 50 years in every movement in Melbourne intended to better the conditions of the mass of the people, Mauger was to be found working incessantly and showing much organizing ability.
Samuel Mauger