I believe most of the 101,000 “uncommitted” votes that Mr. Biden lost in Michigan will come home in the end because they have nowhere else to go, and the threat Mr. Trump poses will become clearer and scarier in the next six months. But regardless, there’s a much bigger opportunity for Mr. Biden if he looks in the other direction. Mr. Trump lost nearly 300,000 votes to Nikki Haley in the Michigan Republican primary. These people are in the moderate center, and many of them could be persuaded to vote for Mr. Biden if he fine-tuned his message to bring them in. And remember to multiply by two: convincing those 300,000 Republicans to cross party lines has the equivalent force of turning out 600,000 Democrats. The same math applies to other battleground states, like Pennsylvania, where 158,000 people voted for Ms. Haley instead of Mr. Trump in the Republican primary — even though she dropped out seven weeks earlier.
I don't think this has been lost on the Biden campaign...just a bit early in the process.