For the first time in Italian history, Italian citizens living abroad were able to vote by postal ballot (without having to "physically" return to Italy to cast their vote) for 12 deputies and 6 senators who will represent them in the Italian Parliament, an unusual system that was supported by Silvio Berlusconi and promoted by Mirko Tremaglia. These parliamentary seats are organised into four constituencies (Europe, North & Central America, Latin America, and Africa/Asia/Oceania). Candidates must live in their respective constituencies.