US party RWA gaps were substantial yet smaller than Canada’s

Evidence

I did not expect to find nearly as strong a difference in RWA scores between the two mainstream American parties as appeared between the NDP and Conservative parties in the more strung out Canadian system. Altogether, the eight studies just described collected RWA scores from 682 Democrats and 549 Republicans (and two Vermont Progressive Coalition members). — Bob Altemeyer, The Authoritarian Specter, 3693