He served as a member of the Legislative Assembly of Alberta from 1913 to 1917 sitting with the Conservative caucus.

Weidenhammer's wife gave birth to a daughter at Elmira, Canada West, on March 24, 1896.

He ran as the Conservative candidate in the electoral district of Stony Plain but finished a distant third place, losing to Liberal candidate John McPherson.

This time Weidenhammer would defeat McPherson in a straight contest winning over 60% of the popular vote.

[4] Weidenhammer would serve out his term in office before retiring from Alberta provincial politics in 1917.