Zogby's new survey (June 12-14, 1,113 LV, MoE +/-3.0%) shows Obama leading McCain by 5 but the pollster writes that Obama's "recent win of his party's nomination has not produced a big bounce." In fact, he lost a bit of ground against McCain:

Obama 47 (-1 vs. last survey May 15-18)
McCain 42 (+2)
Undecided 12

Overall, Obama leads McCain in the RCP National Average by 4.1%.