

Unfortunately the vast majority of wine produced in the United States is in California, followed by New York, Washington, and Oregon, all very blue states (source). Granted the farmers themselves are likely Republicans (as most rural folks are), but this still isn’t quite the “punish the US” effect like boycotting, say, American whiskey (primarily produced in Kentucky, Tennessee, and a variety of other mostly red states) would be.
I read something different re: the cause.
Source