Sure, speaking in terms of why he could bring more votes:
He was a teacher for 20 years and has a Midwestern small town vibe that could appeal to a lot of voters
He has so much charisma and isn't afraid to call out far right leadership, but he does it in a way that does not alienate that voter base. He has even taken his message to fox news.
He started the whole "weird" thing that is now being used effectively to nullify Trump and Vance's empty rhetoric.
His record as gov in Minnesota speaks for itself
He's very popular among labor unions
You really need to listen to him speak to understand his potential impact. Here's a 10 min video containing a few of the interviews I've seen (after the short intro):
https://www.youtube.com/watch?v=k1-nR3dRCAM