The latest statewide Public Policy Polling survey shows Republican gubernatorial challenger Bill Brady leading Gov. Pat Quinn by nine points.  Quinn's level of support is unchanged from PPP's last poll (conducted in mid-June), while Brady's has climbed back up from 34 percent to 39 percent.  Below are the toplines (including Green Party nominee Rich Whitney), with the results of the previous June and April PPP surveys in parentheses:

Brady: 39% (34%, 44%)
Quinn: 30% (30%, 33%)
Whitney: 11% (9%)

In their write-up, PPP analyzes Quinn's challenge in the lead-up to November:

There's certainly still room for Quinn to come back but it's going to depend on whether people vote based on their feelings about the candidates themselves or just choose on party. Among the undecideds 50% are Democrats to only 16% who are Republicans and 67% of them voted for Barack Obama to just 21% who voted for John McCain. Usually you would expect that Democratic leaning crop of undecideds to come home and tighten the race...except that they give Quinn only an 8% approval rating with 49% of them disapproving of him. Getting the votes of Democrats who dislike him is the only way Quinn can pull it out but right now those folks aren't sure what they're going to do.

You can check out TPM's polltracker for the race here.