One third will answer yes to that question on a survey.

The number that actually support the xenophobia in substance is far higher.

There's a poll, I think it may happen regularly, that asked what your party identity was (only Dem, GOO, and independent listed of course) and whether you think marriage between races creates problems. Everyone always focuses on the 30% of Republicans that said yes and not the 15-20% of Dems that said yes. And you know if the question were about Trump saying such things, the Dem number would plunge and the GOP would rise.