Center-left still ahead in last SWG poll before Italian vote
Probable alliance with Monti needed to meet Senate quota08 February, 13:37
Ex-premier Silvio Berlusconi's centre-right coalition, which has been gaining ground in recent weeks, remains steady at 27.8%.
Though Bersani's Democratic Party (PD) is favoured to win the election, the poll suggested it will not have a working majority in parliament.
According to SWG, Bersani's coalition will take only 146 senators with it, less than the required 158.
This has led to speculation that Bersani could make a post-election pact with former European commissioner Monti, who took the helm of an emergency government in November 2011 and is standing for office on a reform platform backed by several centrist parties.
The anti-establishment Five Star Movement (MS5) of comedian Beppe Grillo remains in a steady third place at 18.8% in Friday's poll.
Monti's centrist coalition dropped almost one point (0.8%) with 13.4% of projected votes.