There was a new urgency to campaigning today by President Obama and his rival Mitt Romney, and not just because the big day is exactly four weeks away.
The latest opinion polls have put Mr Romney in the lead - after his strong performance in last week's TV debate.
So now more than ever, as our Washington Correspondent Robert Moore reports, there is all to play for.
The makers of American TV show Sesame Street have asked that the Obama campaign stop using a political advert which features the character Big Bird.
Sesame Worskshop, formerly known as the Children's Television Workshop, issued the following statement:
"Sesame Workshop is a nonpartisan, nonprofit organization and we do not endorse candidates or participate in political campaigns. We have approved no campaign ads, and as is our general practice, have requested that the ad be taken down."
Republican Mitt Romney has erased Barack Obama's advantage in the presidential race and the two candidates are now tied among likely voters, according to a new Reuters/Ipsos poll released today.
With only four weeks until the November 6 election, the poll showed both men each command 45 per cent. Obama had been leading by two points in the last poll on Sunday.
Romney's boost in the polls comes after a strong US presidential debate performance last week.
The online survey of 1,157 likely voters was conducted between October 5 and October 9.
A second poll has put Mitt Romney ahead in the US election - 49 to 47 - and the key battleground Ohio is a virtual tie. Time for Team Obama to panic?
President Barack Obama's lead over Republican challenger Mitt Romney has narrowed to just 2 percentage points since Romney's strong performance in their first debate, according to a Reuters/Ipsos poll released today.
One in five voters said that Obama's performance in the contest in Denver on Wednesday made them feel more negative about him, while almost a third said they felt more positive about Romney.
The poll conducted from Monday to Friday showed 46 percent of likely voters backed Obama, versus 44 percent for Romney. Obama had led by 48 to 43 percent in Thursday's daily tracking poll, the first to include a day of interviews after the debate.
Speaking at a campaign rally in Fairfax, Virginia, Barack Obama has said that the US unemployment rate has fallen to its lowest level since he was elected.
President Obama: “This morning, we found out that the unemployment rate has fallen to its lowest level since I took office.”