Republican Mitt Romney has closed the gap with President Barack Obama and the two candidates are now tied in the November 6 presidential race, according to a Reuters/Ipsos daily tracking poll released on Monday.
The online survey of likely voters found Obama and Romney were each supported by 46 percent of the electorate as they prepare for their final televised debate on Monday night.
Romney trailed by 1 percentage point when the poll was last published on Saturday. The two candidates have remained within three percentage points of each other since shortly after their first debate on October 3.
"Today's number emphasizes the fact that the race is very close. We enter the final debate with the candidates literally neck and neck," Ipsos pollster Julia Clark said.
However, Obama still holds a substantial advantage in the battleground states that will determine the outcome of the election. Ipsos projects that Obama will carry hotly contested states such as Florida, Ohio and Virginia, for a total of 325 electoral votes to Romney's 213 electoral votes.
Reuters/Ipsos online polls are measured using a credibility interval. The survey of 957 likely voters, conducted between October 18 and October 22, has a credibility interval of 3.6 percentage points.