This is the fifth time in six elections that Republicans has failed to win the popular vote, and that raises questions for the party.
ITV News' International Editor Bill Neely reports from Boston:
Now Barack Obama has secured four more years in the White House he must tackle the growing list of challenges facing America.
While both parties called for unity in Barack Obama's second term to solve the USA's problems, Mark Austin found voters fearful of gridlock.
Barack Obama has secured re-election as President on a night of drama in America. Here are the best pictures from election night: