President Obama leads in swing states so far, but the lead is not as big as the one he had at this point four years ago.
About 25 million people already have voted in 34 states and the District of Columbia. No votes will be counted until Election Day but several battleground states are releasing the party affiliation of people who have voted early.
So far, Democratic voters outnumber Republicans in Florida, Iowa, Nevada, North Carolina and Ohio - five states that could decide the election, if they voted the same way. Republicans have the edge in Colorado, which Obama won in 2008.