Ok, Al. When he's expected to be blown out, I'll "spin" a 0.4% loss as a victory any day of the week. Let's not forget the people around here dancing when PdL was polling around 12-15%. But don't worry. There will be an excuse for this, too!
I suppose you're entitled to be relieved that it was merely a catastrophic result (and that it looks comparably less catastrophic because the Opposition did badly as well) rather than a DC-in-1994 style annihilation.
Using the PR figures for 1994, 1996 and 2001, in 1994 Berlusconi's coalition polled 46.3%, in 1996 it polled 42.1%, in 2001 it polled 49.5%, in 2006 it polled 49.7%, in 2008 it polled 46.8% and in 2013... 29.1%.
Of course, the composition of that coalition has always been prone to change. If we look at the results for the PdL from 2008 and the combined Forza Italia/AN vote previously...
1994 - 34.5%, 1996 - 36.2%, 2001 - 41.4%, 2006 - 36.1%, 2008 - 37.4%, 2013 - 21.5%