Berlusconi party keeps poll lead over PD
28% to 26%, Grillo 20.5%13 September, 11:52
Its partner in the shaky left-right coalition, the centre-left Democratic Party (PD), was steady on 26%.
Comedian Beppe Grillo's anti-establishment 5-Star Movement was up 0.7% to 20.5%.
The PD and PdL are locked in a battle over Berlusconi losing his Senate seat because of a tax-fraud conviction and President Giorgio Napolitano has warned against the "dramatic" consequences of a government crisis.