Yep. South Dakota, Nebraska, Wyoming, Idaho, etc. are still physically north of the Pennysvania-Maryland border, and they all have reliable conservative Senators. Thanks for proving my point.
The Mason Dixon line is the Maryland Pennsylvania Border. It ends in Pennsylvania which, to my knowledge, is still east of South Dakota, Nebraska, Wyoming and Idaho, etc. Seemingly the only point being proved here is that you are a bit light on US History.