Barack Obama has arrived at his campaign headquarters in Chicago to thank party workers before he heads back to Washington, Reuters' White House correspondent has reported.
President Obama has called the Congressional leaders of both the Republican and Democrat parties after his victory, a White House spokesperson said.
The President said the American people want the two sides to work together.
Obama faces a Republican majority in Congress.
Herman Cain, who lost to Mitt Romney for the Republican's presidential nomination, has issued a harsh warning to Obama voters in the wake of the President's re-election.
US Senate Majority Leader Harry Reid has said last night's election results show the American people want a balanced approach to deficit reduction and tax policy, Reuters has reported.
Senator Reid called for bipartisan cooperation, saying he will negotiate with Republicans "any time, any issue."
We have to sit down and go to work on it now, not wait. This was really the message the American people sent.
Boris Johnson has congratulated Barack Obama on his re-election, but has also reignited his battle with the US Embassy in London over unpaid Congestion Charge fines:
I am immensely proud of the campaign we ran, and I remain grateful to Governor Romney for the honour of being his running mate.
I look forward to spending some time with my family in the coming days and then continuing my responsibilities as chairman of the House Budget Committee and representative of Wisconsin's First Congressional District.