"There is a saying that the known devil is better than the unknown angel", Rajapaksa said addressing a rally in Jaffna, the erstwhile stronghold of the Liberation Tigers of Tamil Ealam (LTTE).
Rajapaksa said his rival, the opposition unity candidate Maithripala Sirisena, is a stranger to northerners whilst he as president had done much to serve the Tamils.
His Jaffna visit came after the main Tamil party, the Tamil National Alliance (TNA), decided to back Sirisena.
Rajapaksa also faulted the TNA-run northern provincial council.
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"They did not use the money given to them to work for you," he alleged.
The opposition had yesterday alleged that the government had deployed soldiers to keep the Tamil voters away from polls.
TNA won over 85 per cent of the vote and routed Rajapaksa's ruling coalition in the September 2013 provincial election.
A low Tamil turn out is expected to help the incumbent in the direct contest between him and Sirisena.
Meanwhile Rajapaksa suffered the 26th defection of a parliamentarian from his party to the opposition ranks since his announcement of snap polls seeking a third term.
Achala Jagoda of the ruling coalition, the United People's Freedom Alliance (UPFA), joined Sirisena in the endless stream of defections.