The upstart Moore led Strange, appointed when Jeff Sessions resigned to become U.S. attorney general, 41 percent to 40 percent. The special election is Sept. 26.

The survey was produced by Republican pollster Jan van Lohuizen Sept. 9-10 for Senate Leadership Fund, a super PAC tied to Senate Majority Leader Mitch McConnell, R-Ky., that is supporting Strange. President Trump also is backing the senator.

“In just over a month’s time, the gap between Moore and Strange has shrunk, from 6.1 points (Moore’s margin over Strange in the August 15th primary election) to a virtual dead heat,” van Lohuizen said in a memo detailing the poll’s findings.