"A reasonable dem Senator" is a pretty big "if", isn't it?!
I would think the best-case scenario would be keep McConnell, elect McDaniel instead of Cochran, and "expect" McConnell to just step aside as Leader, for whatever reasons...
McConnell’s not going to step aside. Besides that the ‘pubs in the US Senate with maybe six exceptions are all in it for themselves and the DC elite....screw the voter. What’s my point? The HOR, with enough self-proclaimed real consrvatives to do so, didn’t vote Boehner out of power. Do you really think the likes of McCain, Ayotte, Flake, Grahm and Collins (etc) will vote McConnell out of power?