The gap in the polls continues to narrow in the campaign for the presidency of the United States.
The latest poll still has Senator Barack Obama nine points ahead but Senator John McCain is closing the gap.
The BBC reports an NBC poll for Iowa gave Senator Obama 51% voter support, with Senator McCain at 40%.
However, a Reuters/C-Span/Zogby poll issued on Sunday suggested a closer race overall, with Senator Obama only five percentage points ahead of Senator McCain's 44%.
Both candidates are now campaigning in the west. In Nevada, Senator Obama warned supporters that things were likely to get nasty over the final days of the campaign.
Senator McCain was campaigning in Iowa and Ohio on Sunday and Senator Obama went on to Colorado.