Incumbent Sen. Brian SchatzBrian Emanuel SchatzQuestions loom over Franken ethics probe 200 nations plan 2018 talks to keep Paris Agreement momentum Democrats scramble to contain Franken fallout  MORE (D-Hawaii) leads his Democratic challenger Rep. Colleen HanabusaColleen Wakako HanabusaHanabusa defends limited introduction of bills Hawaii judge: Elections will happen Friday Hanabusa to sue to delay makeup voting MORE (D-Hawaii) by 5 percentage points, according to a new poll.

A Civil Beat Poll released Tuesday found 44 percent of Hawaii voters support Schatz, while 39 percent said they’d vote for Hanabusa. Sixteen percent said they’re undecided.

This is the fourth poll Civil Beat has conducted for this race, but the first one in which one candidate has gained a slight advantage, Civil Beat said. Previous surveys suggested the race was tied.

A recent survey conducted by Public Policy Polling for Democracy for American, a group that backs Schatz, indicated he led Hanabusa by 15 percentage points.

Both lawmakers are competing for the Democratic nomination in the Aug. 9 primary. President Obama has endorsed Schatz.

Hawaii Gov. Neil Abercrombie (D) appointed Schatz to the Senate in late 2012, after Sen. Daniel Inouye died.

Abercrombie reportedly received a “dying wish” from Inouye, just after he died, urging him to appoint Hanabusa as his successor. She was elected to the House in 2010. 

The latest Civil Beat poll surveyed 840 registered Hawaii voters May 18 to 19 with a 4.3 percent margin of error.