“Should”
The USA left “should” in about 1950. There is no “should” here.
Workers were abandoned by the Democrats long ago. Union membership is now less than 10% (and most of that is government employees, ironically)… it was almost 50% back in the “good old days”.
There is no labor party in the USA, there is no anti-war party, there is no anti-billionaire party. There should be. But there’s not.