Leftist voters are not stupid, it's just that they are more susceptible to the evil force of envy. Leftism is powered by envy, and leftists are quite smart in using government to lash out against those they envy.
If conservatives can come up with an effective antidote for envy, leftism will be cured as well. Unfortunately the problem has been studied for many thousands of years with little progress. The only effective antidote known, and enshrined in one of the 10 Commandments, is the simple advice to not do it. What can be done when our neighbors continually choose to ignore this profoundly wise advice?
You are absolutely correct. The great majority of Dem voters I know are driven by that simple emotion. I have two close Dem friends who are always obsessed with "the rich" as in "the rich have too much money". Both of my Dem friends had more money and things than I had. But they couldn't get over their feeling that life was unfair to them because someone else had a little or a lot more money than they did. One friend refused to believe that any rich person got his or her money legally or without inheriting it. I suspect that particular emotion, envy, impels most Dems to vote the way they do.