With no disrespect whatever intended to you, mg,
here is my brief attempt at a
"legend" for your post
-- this is how I comprehend it anyhow.

Kl. -- Klobuchar
Bu. -- Buttigieg
WOC -- woman, "of course"
KH   -- Kamala Harris
AG   -- Attorney General
EW   -- Elizabeth Warren
CB   -- Cory Booker

and if I have to tell you who is meant by
"Yang" and   "Castro,"   ... too bad.