For more, we've called Jacob Aday. He's the study's co-principal investigator and a researcher at the University of Michigan. Jacob, welcome. JACOB ADAY: Hi, Don. Thanks for having me. GONYEA: This ...

You're most likely to find NPR's Don Gonyea on the road, in some battleground state looking ... traveling through Iowa or South Carolina or Michigan or wherever, right along with him. President Trump ...

He's the study's co-principal investigator and a researcher at the University of Michigan. Jacob, welcome. JACOB ADAY: Hi, Don. Thanks for having me. GONYEA: This isn't the first survey like this.