The poll with clinton ahead of mccain in 08 was from FEBRUARY. Hardly reliable. An arg poll (I know, I know) in early october had obama up 8. An insider advantage poll (well, they're not arg) a week later had him down only 2.
It's outlandish to believe clinton would've done more than a point or three better than obama, tops.
That same poll from February had McCain ahead of Obama, 53-35, while the result in November was 56-43.
Let me be clear. I'm not taking any particular stand on how HRC would have done in WV in 2008. But such evidence as we have points to her having been more than a point or three more popular than Obama.