Are the "Bernie wing" and "Clinton wing" of the Democratic Party real things?

[MASHED POTATOES. VOTE!]

Rural conservative-identifying Oklahomans

are Republicans. The few Democrats in Oklahoma are quite left wing.

Are you referring to those who are registered Democrats or those who consistently vote Democrat? Because at least until very recently (if not still) most voters in Oklahoma were registered Democrats.

Also, just as a way of knowing, the Panhandle went from supporting Hillary in 2008 primaries, to Randall F-king Terry in 2012 to Bernie in 2016. And Democratic voters, as opposed to those who are for some reason still registered Democrats, are a rarity there.

Certain groups of voters in OK or WV didn't vote for Bernie, but against Hillary (AKA "muh establishment, Obama's third term"). They were occasional fellow travelers at best, not members of Sanders' wing, if such thing even exists the way many people seems to think.