Jane, alas, I don't think you've been actually reading my posts. Part of my original point was precisely that being White is only one of many factors. The other part is that it can, all by itself, explain very little. Furthermore, it's not at play in many situations. But the WP model ignores all that and not only assumes it is always in play but the biggest factor. 

When I use "model" I'm using it in the everyday way associated with basic  science. Not something particular to polling. The vast majority of science is about coming up with a model that allows you to predict--X conditions produce Y results. A good model explains the various phenomena you might observe. Alas, WP breaks almost right out of the gate.  

Finally, what? There's a stereotype that all White people grow up with mothers hooked on crack? Huh? All Indians go to elite private schools? All Hispanics are of middle income with two parents? This is now getting a bit weird.