The outgoing president will vote in Wilmington, Delaware.
The election, set to take place on Nov 5, will see a close race between Republican candidate and former President Donald Trump and Democratic candidate and Vice President Kamala Harris.
According to multiple polls, Trump and Harris have been neck-and-neck for the past few weeks. A final nationwide CNN poll released last week showed them tied at 47 per cent.
The control of 34 Senate seats will also be decided in the election.
-- BERNAMA