Megabus?....

megabus roundtrip from milwaukee to st paul?? safe?

I've taken that bus from Minneapolis to Chicago (which stops at Milwaukee) and it's been fine, no checkpoints.

It seems safe to me as well..

its safe. I took one from Illinois to Iowa.

if your route is not within 100 miles radius from the border, you're safe

Take the Amtrak that seems very cool...