Butch and company,
I have some suggestions for you if you plan to do this run.
Do a 70 mile diversion. Stop at Sault Sainte Marie and watch the flush a ship down the lake. Then run around through Paradise to the Whitefish Point Shipwreck museum. There are numerous different water falls in this area too.
The pictured rocks are worth the cost of the boat ride.
There are several good museums as such in Duluth.
If you get in striking range of Alexandria MN, there is the Rune Stone there that is a fun stop if strange interests you. But if you have stayed with RT 2, you will be too far north.
You will not be too far north for the international Friendship Garden. You can temporarily enter and leave Canada without passing customs. (I hope this is still true.)
If you have gone south to I-90 by half-past Montana, the Museum of the Rockies is an amazing stop.
And yes, Rt-2 is a beautiful road, but don't count on fuel stops and restaurants in convenient places. You will be out of cell phone range a lot of the time.
Matt