The discussion also encapsulates a host of issues dominating the nation’s political conversation: the cost of living, reliance on Chinese manufacturing and cultural factors such as the feasibility of the cross-country road trips that remain an element of American identity. “There’s certainly been a large uptick in the amount of polarization around EVs,” said Robert Fisher, domain principal of electrification at SBD Automotive, a research and consulting firm. That polarization “is a very credible, serious threat” to wider adoption.