Şener entered politics and was elected in 1991 as deputy of Sivas Province from the Islamist Welfare Party (Turkish: Refah Partisi, abbreviated RP). He was Minister of Finance from 1996 to 1997. Following the ban of the Welfare Party in 1998, he became a member of the newly established Virtue Party (Turkish: Fazilet Partisi, abbreviated FP), which was also banned after three years in 2001. He was co-founder of the Justice and Development Party (AKP) in 2001. He was elected to the Grand National Assembly of Turkey as deputy of Sivas Province, and he served under the AKP government as Deputy Prime Minister from 2002 to 2007.
He did not run for a seat in parliament in the 2007 general elections. After leaving the AK Party, he formed a new party; it was officially announced on 27 May 2009 and named the Turkey Party (Türkiye Partisi).[1]
Şener announced that the Turkey Party was officially closed on 27 August 2012 due to difficulties in maintaining its political goals outside of parliament.[2]