They're no more stupid than the average voter in my experience. I understand it's anecdotal but I have dealt with republicans who are quite smart and they vote like they do because they have oil investments or want unemployment to go up to decrease labor turnover in their business.

Ultimately democrats and republicans serve the ruling class. If all the voters who aren't voting republican were smart they would vote for candidates that will make change. They would pick up from their more expensive major cities and move to lower population states, counties, and cities to dramatically shift the representative power. It's just not that simple, people don't want to live in bumfuck wyoming but the system is busted and Wyoming with a population of ~500k has as much say in the senate as California with ~40 million.

I think it's fucking stupid to vote again and again in the same corrupt institution that has been losing to fascism for the past 40 years and expecting a different outcome to be stupid. To vote smart you gotta vote states with low populations and republican inclinations. WY, AK, ND, SD, MT, NH, WV, ID, NB. Seriously, if 200k leftists from around the country moved to WY and flipped two senate seats for leftists it would break almost every senate tie in my lifetime. Notice how voting smart costs money? Yeah, wonder how that came about.