First, let's remember that lawmaking politicians of influence of either party are typically what, 60+ years old? 70+? These guys still have their staff print their emails for them and are surprised when a someone says 'let's watch a movie' and it doesn't involve (at best) a VCR. Not super-quick at adapting to change.
Second, until pretty recently the "target demographic" of electric car buyers was some sprout-eating weirdo from the Bay Area, ie, someone who wouldn't piss on a Republican if they were on fire, ie not someone that ever, in a million years, would VOTE Republican. OTOH, Car Dealerships are relatively typical small businessmen, whose concerns about running a business tend to coincide with GOP viewpoints and platforms. Whether they vote Dem/Rep is irrelevant, it's that they [i]could[/i] vote Republican, so which group would a Republican politician reasonably spend their time serving?