John McCain has moved out to a two-point lead over Barack Obama in the latest Gallup Daily Tracking Poll! This is the first time since early June that McCain has led in the poll. As Gallup explains, this poll shows that Obama has officially received "no bounce" from his selection of Joe Biden as his running mate:

It's official: Barack Obama has received no bounce in voter support out of his selection of Sen. Joe Biden to be his vice presidential running mate.

Gallup Poll Daily tracking from Aug. 23-25, the first three-day period falling entirely after Obama's Saturday morning vice presidential announcement, shows 46% of national registered voters backing John McCain and 44% supporting Obama, not appreciably different from the previous week's standing for both candidates. This is the first time since Obama clinched the nomination in early June, though, that McCain has held any kind of advantage over Obama in Gallup Poll Daily tracking.

The race for president has been virtually tied since mid-August. In this period, Obama's support from national registered voters has consistently ranged from 44% to 46%. The 46% currently supporting McCain is technically his best showing since late May/early June, but is not a statistically significant improvement over his recent range from 43% to 45%.