Obama: Connecticut, Delaware, Washington DC, Illinois, Maine, Massachusetts, Maryland, Vermont, Rhode Island, New York, Michigan, New Mexico, Pennsylvania, New York, New Jersey, Wisconsin, New Hampshire
Romney: Arkansas, Mississippi, Kentucky, Oklahoma, Alabama, Tennessee, Indiana, West Virginia, South Carolina, Georgia, Kansas, Louisiana, Texas, Wyoming, North Dakota, South Dakota, Nebraska, Utah, Montana
More top news
President Barack Obama recorded a video urging for more to be done to protect the landscape from the effects of climate change.
David Cameron is facing growing pressure for the UK to take in more of the many thousands of migrants fleeing to Europe.
China has put on its biggest display of military might in a parade to commemorate victory over Japan in World War Two.