More than four million people voted in Italy 's first nationwide primary and made Romano Prodi , a former prime minister , the overwhelming choice of the center-left to challenge Prime Minister Silvio Berlusconi in the next general election .
Silvio Berlusconi
Italy
/people/person/nationality
Romano Prodi
Italy
/people/person/nationality
LOCATION
Italy
PERSON
Romano Prodi
PERSON
Silvio Berlusconi