It's a bit more complicated than that. Most blue states are geographically almost entirely red, but play host to one or more major urban areas and thier suburbs. In reality the divide isn't red state/blue state, it is rural/urban.
There is a winning endgame strategy here. By way of a hint, keep in mind that the cities have to be fed, and they cannot grow their own food. A "strike" would bring them to their knees.
You are correct. At that point it is no longer about the votes though. It is an area worth studying. Mao had some success in frustrating the Japanese occupation with this strategy, but Lenin was able to move our from cities to dominate and subjugate the countryside however.
Not to mention a sudden curtailment of electricity - no light, heat, water, elevators, gasoline, trains - think of NYC, Boston, Filthydelphia, Detroit, Chicago. In the heat of summer, naturally. If only the parasitic urbanite commie leftists [the takers] knew how they are known and detested throughout the rural and exurbanite areas - the wealth creators, they would live in existential angst.
Whenever I look at the electoral map, awash in red but shot through with blue blotches, it calls to mind the image of a cancer patient being steadily consumed by metastases. Is radical surgery the only hope for cure? The only problem I see with your suggested approach is that farmland could simply be nationalized as an emergency measure, and then equipment and operators would be brought in to farm it after the uncooperative original occupants had been eradicated (just think of custom harvesting expanded to include the whole cycle). Now if people simply torched their harvested crops in protest without planting a replacement in season, they might make a small dent. But I fear that the Starving The Monkeys approach isn’t going to do it at this point; I have this sick feeling that the path America is currently staggering down leads to bloodshed or serfdom, and possibly both. Unfortunately, when I look at America today I see a giant Yugoslavia, just waiting to fracture. I still hope for a Czechoslovakian outcome, but can’t deny the demographics and crime data indicating that there is an element who would be more prone to the Rwandan approach to settling irreconcilable differences.