In a podcast on veganism, two red-pilled herbivores lament the putative association between veganism and leftist politics. Richard Burgess implies this is some sort of new phenomenon*.
If Hitler's vegetarianism gave it cachet on the right, that effect had long since worn off by the nineties. I can still vividly recall a time during my coming of age when a group leftist activists throwing paint on patrons coming out of an Alaskan Fur store.
A couple of times in the mid-nineties the GSS asked respondents if they avoided eating meat for "moral or environmental reasons" (I realize this is effectively grouping vegetarians and vegans together, but we work with what we have). The percentages of those who said they did so either "always" or "often", by political orientation (n = 2,792):
Compare that to hunting, the following showing the percentages who hunt or have a spouse who hunts, by political orientation:
Two decades ago liberals were 51% more likely to avoid meat than conservatives, while conservatives were 49% more likely to hunt than liberals.
It's as reasonable to associate not eating meat with political liberalism as it is to associate hunting with political conservatism.
GSS variables used: HUNT(1-3,4), NOMEAT(1-2), POLVIEWS(1-3,4,5-7)
* It's worth noting that he is from Canada and Tara McCarthy is from Great Britain while the subsequent evaluation of their assumptions comes entirely from US data, so the trends may not hold across the Anglosphere.