Well,
If Trump wins the WH, Portman wins.
And if Clinton wins the WH, Strickland wins.
No party split ticket!
Not true.
Strickland can well win Trump voters in Appalachia who would be turned off by Portman's trade record.
So you believe Strickland is going to overperform Hillary???
I don't think it's plausible Portman is elected if Clinton wins, but I do think it's plausible Strickland gets elected if Trump wins. Unlikely, but plausible.
It's less about outperforming and more about where they will be performing. I expect Clinton to have higher numbers in the North East than Strickland, and I expect him to have higher numbers in Appalachia, where he may well get some split-ticket support.
Portman: pro-trade, against TPP for election
Strickland: hard anti-trade
Clinton: pro-trade, against TPP for election
Trump: hard anti-trade