The poll, released Tuesday, shows Obama leading McCain by a 45 - 43 percent margin which falls into the three percent margin of error.
What's behind the move? The director of the poll credits negative attacks launched by the Republican's campaign.
The McCain team rolled out a number of ads in the past month displaying Obama as a lightweight, inexperienced celebrity-type who, according to the tagline, "isn't ready to lead."
Obama's favorable rating dropped 11 points during the period falling from 59 percent to 48 percent while McCain's numbers remained constant.
Dan Schnur, director of the Jesse M. Unruh Institute of Politics at the University of Southern California, last week told the Christian Science Monitor that the McCain ads, which label Obama a celebrity, were successful because of the way it connected criticism to a perceived flaw.