Barack Obama and Mitt Romney are trying to get out their supporters for what both sides expect to be a close fight to the American presidency on Tuesday.
Today presenter James Naughtie is in the United States for the climax of the election and has been watching the voters and the candidates.
Reporting from President Obama's home city Chicago, he heard how racism and segregation is still rife in many parts of the US.
A local teacher and writer explained that "the racism in this country, which seemed to me to be getting better for a while, has got much, much worse in the last four years."
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