According to an automated survey by Public Policy Polling, the lieutenant governor has a seven-point lead over the state treasurer in the race for the Democratic gubernatorial nomination.
Perdue had 41 percent of likely Democratic voters; Moore, 34 percent.
The same tracking poll showed a Perdue lead of 27 points three weeks ago, which dipped to 10 points last week. Pollster Tom Jensen argued that Moore's attack ads may have helped.
For the first time this survey, the polling company also expanded its definition of likely voters.
The poll also showed that 50 percent of Democrats said they could change their mind before the May 6 primary.
The Democratic polling firm surveyed 673 likely Democratic voters on March 24. The margin of error is plus or minus 3.8 percentage points.