Baykal had initially resigned as leader after the 1999 general election where the CHP lost all its parliamentary representation.
The convention began at 11:30am with a tribute to Mustafa Kemal Atatürk and İsmet İnönü and a recital of the Independence March.
Deniz Baykal had initially resigned after leading his party into an electoral wipeout at the 1999 general election.
Baykal stressed that Turkish politics was going through a difficult time, referring to the disagreement between Prime Minister Bülent Ecevit and President Ahmet Necdet Sezer and the subsequent financial crash.
In his speech lasting 1.5 hours, Baykal stated that the party's tradition of factionalism had to change and peace had to exist between members.
He blamed his party's poor election result in 1999 on the 'hypnosis' of PKK leader Abdullah Öcalan's arrest and Bülent Ecevit's subsequent rise in popularity.
He claimed that should he be re-elected, the CHP would 'run to power' and pressured inner-party rivals to not damage the party through infighting.
Hasan Fehmi Güneş's campaign focused mainly on the failures of both Baykal and Öymen, claiming that neither leader had been able to create policies or a strong leadership.
Hurşit Güneş initially expressed an intention to stand for the election, but withdrew after the other candidates were finalised.