He was the Member of Perak State Legislative Assembly for Changkat Jering from 2008 to 2013.
Mohd Osman was active in PKR and agreed to the ideology of Anwar Ibrahim.
His experience as a leader in the army got him a lot of support in Changkat Jering.
Jamaluddin Mohd Radzi, Hee Yit Foong and him has caused the Pakatan Rakyat government to be toppled by being independent politician in the 2009 Perak constitutional crisis.
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