Pretty obvious. Some college town people, some government employees here and there, Millennials (specifically in urban areas), your run-of-the-mill urban White liberals and a few Yellow Dogs who have somehow managed to avoid dying yet.
You like speaking in really simplistic, absolute sentences, don't you?
EDIT: I'll try not to just say something snarky out of my annoyance for your desire to simplify things. Obviously, a majority of old White Southerners are voting Republican straight ticket in Mississippi. However, you asked who the White Democrats in Mississippi were. I listed SEVERAL groups that would have much more substantial numbers in the broad group defined as "Mississippi Democrats (who are White)," but there are obviously going to be SOME lifelong Democrats in the South who still largely vote the party line. Our own "How do your relatives vote?" threads have provided real-life examples of this.
