Barack Obama seems to be registering a belated bump in the polls since securing the Democratic nomination a week ago.

The Gallup daily tracking poll Tuesday showed Obama with a 7 percentage-point lead nationally over presumptive GOP nominee John McCain, Obama's widest lead since Gallup started the general election polling in March.

McCain was leading Obama by 1 percent early last week, but Obama started to tick up in the surveys after he defeated Hillary Clinton for the nomination.

Clinton formally conceded Saturday in Washington, D.C., and urged her supporters to close ranks behind Obama.

The latest reading from Gallup showed Obama with 48 percent to McCain's 41 percent. The poll was taken June 7-9, of 2,633 registered voters. The margin of error was 2 percentage points.

Click here to read more on the Gallup survey.