Nicolo Machiavelli wrote:
"I conclude therefore that, fortune being changeful and mankind steadfast in their ways, so long as the two are in agreement men are successful, but unsuccessful when they fall out. For my part I consider that it is better to be adventurous than cautious, because fortune is a woman, and if you wish to keep her under it is necessary to beat and ill-use her; and it is seen that she allows herself to be mastered by the adventurous rather than by those who go to work more coldly. She is, therefore, always, woman-like, a lover of young men, because they are less cautious, more violent, and with more audacity command her."
The Prince. Chapter XXV.
Renzi is the adventurous and young man, whereas Letta is an older, cautious and reserved one. It's obvious which one is the chosen by Fortune.
In this video you can see an even younger Matteo Renzi circa 1994 as a contestant on the Italian version of Wheel of Fortune, obviously broadcasted by one of the Berlusconi's channels:
http://www.youtube.com/watch?v=LKbYpboK5eERegardless which man the changeable Fortune prefers, I wish a long live to Giorgio Napolitano, the only one who shows some decency in this shadowplay.