I'm not disagreeing with you - we have millions of utterly useless blue haired cnuts here too. It's just that we have a greater number of normal people who can see what a disaster socialism would be.
The answer to winning an election is not to make the minority demographic that votes for you anyway love you even more.
You must appeal to the swing voters to win. Which Sanders absolutely does not.
It's not just the Blue haired types or the swing voters that are the problem though, then we have the so called Sanctuary States and non Sanctuary States such as California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maryland, Nevada, New Jersey, New Mexico, New York, Oregon, Utah, Vermont and Washington.
All issuing State driving licences or State ID which in States that requires ID to vote allows people who are in the country illegally to vote and only two or three of the above require ID to vote. I didn't mention D of C because although not a State they still issue Driving licences to illegals.
The Democrats are against voters having to produce ID to vote, why do you think that is I wonder. The above States are already breaking Federal law by being Sanctuary States and issuing driving licences, so make what you will of that when it comes to voting and who they allow to vote and then count those votes in the returns.
Sanders is very pro Sanctuary State and cities.