Voter registration matters nothing compared to actual voting, or NH would be a red state and KY would be a blue one.
Kentucky Democrats aren’t real Democrats
Of course, and KY is a titanium red state. Elliott County gave Trump 75% but is still only 10% registered Republican (maybe more like 15% now). But that's my point - voter registration can be very misleading, as some 'Democrats' may be Republicans in practice, and vice versa. Actual voting is what matters. Otherwise Elliott would be a very blue county, not a very red one like it is in real life.