Jeremy Vine
Media playback is unsupported on your device
Video

US election: How Barack Obama's victory unfolded

President Barack Obama has been re-elected to a second term, defeating Republican challenger Mitt Romney.

With results in from most states, America's first black president has secured the 270 votes in the electoral college needed to win the race.

The BBC's Jeremy Vine explains how President Obama won re-election.

Go to next video: US election: Moment Obama won