Final preparations are being made in Las Vegas for the third and final presidential debate which is being held at the University of Nevada.
The latest opinion polls show Republican nominee Donald Trump falling further behind his Democrat opponent Hillary Clinton.
Mr Trump currently trails Ms Clinton by 7 points in national opinion polls.
Among those following the election are Americans who would probably never be screened by a pollster.
They live in a labyrinth of underground stormwater drains in Las Vegas which have become home to nearly one thousand people battling poverty, drug and gambling addictions.
