Of course North Dakota is a sure Republican state. Youngkin might be able to pull Virginia into Trump's column. But the criterion should be who would make the best President if something happened to Trump. Don't repeat the mistake the Republicans made in 1864. Second most important criterion would be someone that would deter the Democrats from trying to get rid of Trump.
That may have been what the founders envisioned, but in the modern age the most important criterion for a VP candidate is helping the President get elected.
Opps, you're right!
the criterion should be who would make the best President if something happened to Trump
That's a good point.