Much of this is aimed at weakening the hand of the main anti-austerity candidate, 37-year-old Alexis Tsipras.
Alexis Tsipras, the leader of the Syriza party, leads in polls ahead of the June 17 election.
Its leader, Alexis Tsipras, said on Friday he could not join any coalition that intended to implement the bailout deal.
BBC: Greece bailout crisis: President seeks unity government
Alexis Tsipras is the 38-year-old leader of the Synaspismos party, and rose to prominence as its candidate for the mayor of Athens in 2006.
If Alexis Tsipras, the charismatic Syriza leader, pulls his party into first place, he would have to find coalition partners among the same parties.
Alexis Tsipras, the leader of the leftist Syriza party, which came in second, met with Samaras but said Monday he would not back a coalition.
CNN: Greek party official: Coalition talks to be held Tuesday
Mr. Samaras first met with Alexis Tsipras, the leader of leftist Syriza, which has become the new force in Greek politics after campaigning on a fierce antiausterity ticket.
And even its supporters are doubtful that a coalition with Syriza, a left-wing party led by Alexis Tsipras, a 34-year-old who has never run for parliament, would work.
Younger voters may prefer the Greens (who won a seat in the European election in June) or Syriza, a left-wing splinter group run by Alexis Tsipras, a fast-talking, 30-something biker.
But it is the rise of the left-wing Syriza grouping and its charismatic young leader, Alexis Tsipras , that has really got the markets and the European Union establishment rattled.
Speaking in a nationally televised statement, Syriza leader Alexis Tsipras congratulated Mr. Samaras on his victory but indicated he wouldn't support a government that continues with Greece's tough program of austerity and structural overhauls, known here as the memorandum.
Speaking at Omonoia Square downtown Athens, the leader of the leftist SYRIZA party Alexis Tsipras re-iterated his position that this election is a referendum on the EU-IMF Memorandum, and his pledge to declare it void, if he wins the election.
The bad news is that the main beneficiary of public disillusionment is Alexis Tsipras, leader of the intransigent hard-left Syriza, who claims to "listen to the people" while rejecting the kind of unity government that more than 70% of Greeks said they wanted.
Syriza's leader Alexis Tsipras not only conceded early, but assured the press he would not try and form a coalition of his own: that is, he would not be waiting to tempt Pasok and the Democratic Left into a Syriza-led coalition if the main talks fail.
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