Kamala Harris and Donald Trump are making their final pushes for the presidency on the eve of election day.

Harris is spending the day in the largest battleground state, Pennsylvania, and Trump's turned his attention to North Carolina, Pennsylvania and Michigan. 

NZ Herald deputy political editor Thomas Coughlan is in Pennsylvania.

He says everyone seems confident - but it's not over until it's over.

"At the moment, it looks like all the races and all of the swing states will be close - and tomorrow night will be fairly inconclusive." 

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