Democracy Corps (D) is out with a new national poll that includes numbers for a two-way race for the first time since their poll in late July. In the current survey, Obama leads McCain by three:

Obama 49
McCain 46
Undecided 4

With three of the four tracking polls also updated this morning showing Obama maintaining his advantage (Rasmussen +8, Hotline +6, Battleground +7), Obama's lead over John McCain in the RCP National Average currently stands at 6.0%.