Rep. Gary Peters (D-Mich.) leads his likely Republican opponent for U.S. Senate by 9 percentage points, according to a new poll. The survey comes on the heels of a pair of other polls showing Peters leading by a slimmer margin.

The EPIC-MRA poll shows Peters ahead of former secretary of state Terri Lynn Land (R) 45 percent to 36 percent. The poll was of those likeliest to vote in the November election. 

In May, Peters was leading by 6 points.

Two other polls this month suggested that Peters held a slight advantage. Denno Research found Peters with a 3-point lead among likely voters (inside the margin of error), while NBC News/Marist showed Peters up 43 percent to 37 percent among registered voters.

The EPIC-MRA poll is by far the widest of those leads, but altogether the polls agree he is at least up by single digits.

Peters and Land are expected to be nominated by their respective parties. The EPIC-MRA poll was conducted July 12-15.

Scott Clement contributed to this post