When J.Wick refers to being preacher colored he is referring to the Walkers that are predominately blanketbacked with black with tan or brown running clear to it's feet. Generally the will have white feet, under belly and chest and some white on the head or face. They look similar to the old grade high tan black & tans which Preacher may have had some B&T breeding behind him.
The Preacher coloring seems to be a pretty dominate trait as in most dogs colored this way are carrying some preacher breeding even if it is way back.
here is a pic of a male out of my dad's female, Nt Ch PR Ristau & Brogan's Coon Crk Maggie and Gr Nt Ch PR Adreon's Iowa Buckeye who goes back to some Preacher breeding.
http://www.hunt101.com/img/450916.jpg