Populists and conservatives, unlike libertarians and liberals, have nearly identical views on social issues for very similar reasons - moral standards. Libertarians and liberals have similar, but not identical views (i.e. gun control) but for totally different reasons.
Both populists and conservatives supported this, but not every one of either. It is also worth noting that it is rare to see an extreme populist - even in states like West Virginia, most are just as socially conservative as Kentucky state and economically liberal as New York, at most.