No it isn’t. There is no common culture. This is a country with 3 different names for the same sandwich, 4 different major traditions for the same style of cooking meat, the idea that there is a common culture here is laughable.
What foundational set of traditional American values did Obama run on? Or Bill Clinton? They both voiced a lot of support for anti-American values and moved right into the White House.
Food defines culture only by shallow minded thinking, usually on the left or in academia. What people eat is as superficial as you can get in terms of looking at culture.
There are no democrat politicians who get elected by admitting to their anti-American views. Clinton ran as a conservative. Obama ran as a populist who favored conservative policies including tax cuts. Of course, what these guys say depends on who their audience is at any given moment.