Obama had led McCain by eight points in the Gallup Poll Daily tracking during and just after the Democratic National Convention in Denver. However, in surveys conducted Wednesday through Friday, Sept. 3-5, the lead shrunk to two points, Gallup said on its Web site Saturday.

"It appears that McCain is now enjoying a rebound bounce coming out of the Republican National Convention in St. Paul (Minn.) that is nullifying some of Obama's gains," the Princeton, N.J., polling firm said.

Interviewing for the Saturday report included some voter response to the acceptance speech delivered Wednesday by vice presidential nominee Gov. Sarah Palin, and McCain's acceptance speech Thursday.

Obama and McCain were tied 45-45 going into the two-week convention period.

The poll results are based on interviews with 2,765 registered voters, with a maximum margin of sampling error of 2 percentage points.