Nightmare scenario is this
Obama approvals down to the upper 20s low 30s in 2016.
Republicans lose Nothing while they gain Nevada Colorado
After 2016 that puts it as
Rep 56 Dem 44
Then in 2018 The republican president is as popular as Bush was in 2002 and Clinton in 1998
They gain Indiana, Missouri, Virginia,Ohio, Pennsilvania, Wisconson, Montana, West Virginia
Put it at
Rep 64 Dem 36
But the possibility of this happening are next to nothing
LOL! The possibility of that happening is ZERO.
First of all, NO REPUBLICAN can win in 2016. Whether Hillary is the nominee or not.
Secondly, they won't gain Wisconsin, Pennsylvania, West Virginia and Ohio. Not enough racist, old rednecks there.
Thirdly, a Republican president wouldn't be popular.