NEW YORK - One week away from election day, the Presidential race could scarcely be closer, with polls showing the candidates -- President Barack Obama and his Republican challenger Mitt Romney -- tied nationally and in several key swing states.

A new Pew Research poll released on Monday shows a dead even national race, with President Obama and Romney tied among likely voters at 47 per cent apiece. The previous Pew poll, conducted at the beginning of October, showed Romney ahead of the President by 4 points nationally, 49 to 45 per cent.

Pew's latest survey also reflects a turnout edge for Romney, whose voters are more enthusiastic about casting their ballot - 76 per cent of Republican and Republican-leaning voters describe themselves as likely to vote, while only 62 per cent of Democrats and Democratic-leaning voters say the same. The Pew poll, which surveyed 1,495 likely voters nationwide and has a margin of error of plus or minus 2.9 points, was conducted between October 22 and 28.

The close national race is reflected in several new swing-state surveys as well, with Obama and Romney statistically tied in new surveys from Florida, Colorado, and North Carolina.

In Florida, a CNN/Opinion Research poll released shows Romney ahead of the President by one point, 50 to 49 per cent, a statistically insignificant edge for the Republican.

The CNN poll, conducted between October 25 and 28, surveyed 770 likely voters and has a margin of error of plus or minus 3.5 points. Meanwhile, Monday's American Research Group (ARG) survey of likely voters in Colorado also shows Romney with a statistically insignificant one point lead over the President, 48 to 47 per cent.

 The ARG survey polled 600 likely Colorado voters between October 25 and 28 and has a margin of error of plus or minus 4 points.

Finally, despite some recent polls suggesting that North Carolina might be slipping out of Obama's grasp, a new Elon University survey released shows the race all tied up in the Tarheel state, with both candidates netting the support of 45 per cent of respondents. The Elon survey polled 1,238 likely voters between October 21 and 26 and has a margin of error of plus or minus 2.79 points.