I don’t know how many of those, other than Rahall (who’s had a pro-life voting record in Congress for decades) is pro-life, but I’m betting that whoever is nominated (who could well be someone not on your list) will at least claim to be pro-life and run to Capito’s right on abortion.
In 2010, state senator Mike Oliveiro ran for Congress in WV-01 (in northern WV) as a strongly pro-life, socially conservative Democrat. He won the primary handily against scandal-plagued incumbent Allan Mollohan, and then came within 0.80% of beating David McKinley in the best GOP year in a couple of generations in the most Republican district in the state. So it would not surprise me if a pro-life state legislator of whom we’ve never heard could win the RAT nomination and run neck-and-neck with Capito in the general.
I think the sole reason Oliverio lost was because he really pissed off the Democrat party establishment liberals in the state (because Republican McKinley wasn’t what I would’ve termed a premier candidate). He’d be better off switching parties and running for another office in the state (though he passed on this past year when he should’ve made a move).