The Michigan contest was initially viewed as Toss-Up/Lean D by every major prognosticator, it's only because of Land's terrible campaign that it's now in the Likely/Safe categories of everyone but Charlie Cook.
That's because most prognosticators don't know their @ss from a hole in the ground. Had they actually paid attention to Terri Lynn Land as a candidate, they'd have known that she was a lightweight. And they should've known that Peters was a skilled campaigner.
Their own ignorance is their fault.