Sen. Gary Peters (D-Mich.) leads his Republican 2020 challenger, John James, by single digits, according to a poll released Monday.

An Emerson College poll of Michigan’s Senate race next year found Peters leading James by 6 percentage points, 46 percent to 40 percent, a distinct improvement for the incumbent, who was nearly tied with James, 44 percent to 43 percent, in the same survey in March.

One issue that could weigh Peters down in the general election is a poor approval rating in the poll for Gov. Gretchen Whitmer (D). Thirty-eight percent of voters disapprove of the job Whitmer is doing, while 31 percent approve and 27 percent have no opinion.