> Political elites tend to be highly coherent

Coherence might not the word you're looking for. The policies of political parties and groups are born out of historical circumstances and the diverse coalitions they represent. Political elites are "coherent" in the sense that you can expect them to consistently follow the party line, and thus infer all of their views just by knowing one of their views.

The party line, i.e. platform of the Democratic and Republican parties, or any other large political party in the world, is, by itself, nothing coherent though. Many of their policies and claims do not make any more sense besides each other than they would make against each other. Realignments on issues are pretty common across the world. What is left-wing in one part of the world at one point of time might be rightist across space and time.