This is where the national daily tracking polls stand as of today:

Rasmussen: Obama 50 (nc), McCain 46 (nc)
Diageo/Hotline: Obama 50 (+1), McCain 40 (-1)
GW/Battleground: Obama 49 (-1), McCain 45 (+1)
Reuters/C-Span/Zogby: Obama 49 (nc), McCain 44 (nc)
Gallup (Traditional LV model): Obama 49 (nc), McCain 47 (nc)
Gallup (Expanded LV model): Obama 51 (nc), McCain 45 (nc)
(change since yesterday)

*Gallup Tracking "Traditional" and "Expanded" Likely Voter models are weighted at 50%, so that the survey only counts once in the RCP National Average.

Obama leads by 6.8 points in the RCP National Average