In 1996, Seppi founded with several like-minded persons the party Unitalia, whose current chairman he is. In 1998 he got elected into the Landtag of South Tyrol and became thereby also a member of the regional council of Trentino-Alto Adige/Südtirol.
Since January 2008 the party was the provincial section of The Right in South Tyrol, but left that party as soon as in November, when Seppi decided to join the Movement for Italy (Movimento per l'Italia/MpI), a split from "The Right" led by Daniela Santanchè and since then Unitalia became the provincial section of the MpI.
In the 2008 provincial election the party won 1.9% of the votes and Seppi was re-elected to the Landtag. However, in the 2013 provincial election Seppi and his party failed to gain a seat with only 1.7% of the votes.
- Consiglio della Provincia autonoma di Bolzano | Comunicati stampa dei gruppi consiliari
- Movimento per l'Italia
- "Wahlergebnisse Südtirol insgesamt". Website of the Autonomous Province of Bolzano – South Tyrol with the outcomes of the elections 2013. Retrieved 2013-10-31.