Republican presidential nominee John McCain received a post-convention bounce and now leads his Democratic rival Barack Obama 48 percent to 45 percent, according to the latest Gallup daily nationwide tracking poll released Sunday.

The poll covers the period of Sept. 4-6 and includes two days of interviews since the end of the Republican convention Sept. 4. A tracking poll for the same period by Rasmussen Reports shows McCain and Obama tied at 48 percent each.

Gallup analyst Jeff Jones, told USA Today that McCain "is receiving a convention bounce just as Obama did last week." Jones said that the support for McCain was equal to his previous high in May.

Obama has led McCain for most of the campaign, Gallup said on its Web site.

The poll, based on a three-day rolling average, was based on 2,765 interviews with registered voters and has a margin of error of plus or minus 2 percentage points.