Sergey Parkhomenko, for example, seems to think that Trumps supporter is different from a person who voted for Trump in the presidential election. Which can also be phrased differently: not everyone who voted for Trump is a Trump supporter:
I wonder if this is in fact how this phrase is used.
P.S.: I remembered this survey because I saw tweets pressuring Shopify to give the boot to Breitbart store. Which sells items that look humorous and completely innocuous.