Chief Minister and Naga People's Front president Neiphiu Rio was contesting the Lok Sabha poll against Congress candidate K.V. Pusa.
In Manipur, around 70 percent of the total 911,699 voters in Outer Manipur Lok Sabha constituency cast their ballot with polling passing off peacefully, officials said.
Police said there were some scuffles between members of rival political parties in Ukhrul and Churachandpur districts.
Voting in the Inner Manipur constituency will be held April 17.
In the last Lok Sabha elections in 2009, the turnout in the state was 77.82 percent.