Corriere gives a 9% advantage while la Repubblica gives a more prudent 4%.
Partial results in from key regions do not bode well for the Democratic Party. Abruzzo, Campania and Sardinia are solidly in the hands of Berlusconi while Lazio is still very close. Liguria has gone to the Left- the only key region in their hands.
It appears that Berlusconi will have a comfortable majority in the Senate.
I don't think much voter fraud was possible- or necessary.