After a campaign that has lasted for months, people across the United States are voting to choose their new president.
Barack Obama is spending the day in Chicago, Illinois – his adopted home city. He already cast his vote there last month.
He stopped at a local campaign office and made phone calls to thank volunteers. He also congratulated his Republican rival Mitt Romney for what he called a “spirited campaign”.
The president, for whom a second term is at stake, said his Democratic camp was confident it had the votes to win, but it would depend ultimately on whether those votes turn out.
With the polls continuing to suggest a very tight race – the latest give Obama a slender lead in the vital swing states – it is thought even peripheral factors such as the weather could make a difference.