This just shows how useless a single-dimension left/right axis is. There were plenty of socially conservative Democratic party members then (and now, but moreso then).
This was also a time when the majority (>50%) of Americans disapproved of mixed-race relationships, according to Gallup. That percentage only fell below 50% in 1993, IIRC.
Tipper Gore and Joe Lieberman would like a word.