New Reuters/Zogby national survey (July 9-13; 1,039 LV, MoE +/- 3.1%) shows Obama with a seven point lead over McCain, 47-40. That's a slight improvement from the five point lead he held last month, but it's not a result of increased support for Obama but rather a slight down tick in McCain's support:

Obama 47 (nc vs. last poll in June)
McCain 40 (-2)

Overall, Obama's lead in the RCP National Average is now 4.9%.