This week the 39-year-old former mayor of Florence, Matteo Renzi, was invited by his party to form a government in Rome. If he succeeds, he will be Italy’s youngest-ever prime minister. Renzi has never had a job in central government or even been a member of parliament. His governing record in Florence is paper-thin. But lack of experience was not a setback in his quest for the top job in Italian politics. It was, in fact, his main qualification.