Italians vote today in a referendum on constitutional reform which will decide the political future of Prime Minister Matteo Renzi, who has promised to resign if he loses. <br/><br/>Financial markets and Europe's politicians fear victory for the opposition 'No' camp could trigger political instability and renewed turmoil for Italy's battered banks, pushing the euro zone towards a fresh crisis. <br/><br/>All surveys published in the month before a blackout was imposed on November, 18th put the 'No' camp ahead. Private polls have continued to be conducted in the last two weeks and bookmakers say 'No' remains the clear favorite to win.