I understand what you mean by this and agree with you.
In addition to Bush II's politics, his self-cultivated image as a rural cowboy (albeit born in Connecticut to a preppy New England political family) creates an image that one could associate with (above all over quadras) Delta--down-home, country-western, straight talkin' simple man.
This conservative, non-intellectual, 'country-boy' image belongs largely to Delta, unfair as it may be.
(Of course, betas can be cowboys too... I recently saw Brokeback Mountain...)