I think your mistake is believing the left and right coast liberals will be affected at all. They will continue their lives. Any disruptions to the food supply will be compensated quickly from other areas, including foreign....at their invitation.
Washington DC will be unaffected, but the "emergency legislation" will be massive and will transform everything.
After 9/11, people outside the NY & DC areas went right back to their routines while the WTC was still burning.
Los Angeles and Chicago were business as usual...and where the left started to disrupt our national unity.
The same would be true of a Yellowstone eruption....LA, NYC and DC would go right back to work as usual.
It would be news for a week or so before the media moves onto other things. Look at the latest midwest flooding that got almost zero attention elsewhere in the country.
Look, we can have fun with this conjecture all day. Until the extent of an eruption (small or large) is known and what the actual affects are, we will not know how it will play out. It also depends who is in control in DC.....socialist or Conservative.
An eruption on the scale of a Yellowstone super volcano would be a bit more devastating than some Midwest floods. It would dump ash over a large part of the country, and disrupt worldwide weather patterns for possibly years. The worldwide food supply will be severely impacted. Add to that the fact that we sell food to many other countries, further decreasing the world food supply.
I don’t think other countries would necessarily provide us their limited food, either. Trade depends on each partner providing something of value. What value could we offer, when our economy is all but destroyed? We can give them dollars, which at that point would be just paper.
In short, the entire world would be put in survival mode.