COLUMBUS, OHIO – A poll released Thursday of Midwest swing states shows President Donald Trump’s popularity in Ohio remains strong. But respondents in Michigan favor change. The president maintains a slim lead Pennsylvania and Wisconsin is a toss-up.

Trump's approval among likely Midwestern voters in the four Great Lakes states is up, but that same group of voters is split between the president and his likely November opponent, former Vice President Joe Biden.

The poll, spearheaded by Baldwin Wallace University's Community Research Institute in partnership with Oakland University and Ohio Northern University, questioned self-identified registered voters in Ohio, Michigan, Pennsylvania and Wisconsin.

It found President Trump has an approval bump in recent days, with favorability ratings between 41% and 47%. The president is trending higher in Ohio and Pennsylvania than in Michigan and Wisconsin.

Also, Democratic voters are favoring a woman as the vice presidential nominee. When asked, a majority of Democratic voters thing it is "very" or "somewhat" important that the VP nominee be a woman.

Additionally, respondents were split in who they would vote for "if the election was held today." Trump leads in Ohio and Pennsylvania, while Biden leads in Michigan. The poll considers the contest a toss-up in Wisconsin.

The poll was conducted between Mar. 17 & 25, 2020. Sampled individuals were emailed by an online sample aggregator and responded using a personalized link to the survey.