It used to be a staple of Democrat practice that there would be special consideration for the rednecks, the working men. And so there was some sense in such loyalty. This has now given way to screaming raw demonic Marxism.
From the Great Depression until the era of Identity Politics and the rise of power crazed left wing militants like Pelosi, Reid, Schumer, Durbin and Obama, the democrats were considered to be the party of the working man and republicans were reviled as the party of the wealthy.
There has been a great reversal in their positions since that time. For quite a while democrats have been the party of the wealthy elites (especially the newly rich) and the moochers. Democrats offer nothing to the middle class except higher taxes, inflation and loss of freedom. But union workers have been slow to make the switch in allegiance from the democrats, in part because of inertia - "That's the way daddy always voted." But mostly because of their wealthy leadership who have developed a self serving relationship with powerful democrats.
The truth is that any working person who votes democrat is voting against their own self interest.