back in 1980’s when Reps were blue Dims were red (for Reds).
Anecdotally I heard market testing showed americans related more to blue than red in political charts so voila! the colors were switched from then on. Then the rats build a convention with Mauve and off white stripes behind the speakers. Like they have to wear pink sox under their blue suits ala La Cage aux Faux.
Texas used to go to the dems. that’s the point.