Michigan’s Gary Peters doesn’t typically attract a lot of attention.

But as one of only two Democratic senators up for re-election in states that President Donald Trump carried in 2016, the mild-mannered Peters might find himself in the spotlight next year.

Republicans see the ranking Democrat on the Homeland Security Committee as an undefined incumbent.

“40% of Michiganders wouldn’t be able to pick their junior Senator out of a line-up, and only a third approve of the job he’s doing,” Kevin McLaughlin, the executive director of the National Republican Senatorial Committee, said in a recent email, citing Morning Consult data from last fall.

Peters’ re-election will be held up as a test of whether the 2016 election represented, as some have suggested, a political realignment that threatens down-ballot Democrats in presidential years or whether Democratic success across Michigan in 2018 spells trouble for a Republican Senate nominee running on the same ticket as Trump.