I hadn't heard of him either, but reading up on him, he sounds like a good pick. Very down to earth, comes from a rural, middle America background, worked in commerce before going into teaching, ex high school football coach, long time National Guardsman. Has passed a lot of good progressive legislation in Minnesota.
Compare and contrast with Trump's pick, oddball Vance, who even staunch Republicans are saying is a disastrous choice. What else would you expect from convicted fraudster and sex criminal, the Orange Manbaby?