People often vote the way the way they do because of long-standing ethnic or racial or regional loyalties, so they aren't as easy to pick off as it might appear if they were voting solely on the issues. That goes for a lot of Democrats who aren't "solid liberals."
I totally agree...I know many Americans of Hellenic descent who were ridiculed by family for not doing their duty and voting for Dukakis despite the fact that he was utterly useless. I am sure the same happened to blacks with Obama.
The key to transformation is many cases is getting that foot in the door. These survey results, as slanted as Pew may have made them, suggest that while Solid Liberals are (for now) beyond reach, there any many people who can be "saved" that have more in common with normal Americans. There may be deeply-ingrained beliefs about Deplorables that may be hard to break, but you don't need to make them full-blooded bitter clingers...just show them enough truth so they make that first step toward freedom.