63-year-old Srisena's rally was well-attended at his in the north-central province and was addressed among others by fellow defectors and other opposition leaders.
The United National Party (UNP) candidate's campaign received a further boost today as another cabinet Minister quit the Rajapaka-led Sri Lanka Freedom Party (SLFP) government.
Navin Dissanayake, the Minister of Public Management Reforms, left the coalition accusing it of corruption.
"I have come out against corruption, mismanagement, extravagance and waste", he said echoing the opposition's campaign theme of greater democracy and government and electoral reforms.
Also Read
So far, four members of the Rajapaksa cabinet have now defected to the opposition led by the UNP.
The opposition parties are to sign a pact tomorrow to commit themselves to a reform package, main among which is to abolish the system of executive president within the first 100 days in office.
Seeking a record third term after he pushed through changes to the constitution, Rajapaksa has ordered snap polls on January 8.