The Tea Party fundamentally and radically transformed the GOP. It can be done.
Unfortunately, the Democratic constituency is too impatient and too distractable and stupid to do it. The GOP has been playing the long game since Reagan, and they are good at messaging and good at being happy with incremental wins. Dem constituent groups are great at swinging for the fences every 4 years and failing, and great at circular firing squads of blame and purity testing. They suck at having allies that agree with them on 95% of the issues. They suck at getting on the bus come election time. They have been trained to be this way by the GOP.
Time was, unions were the counterweight to the capitalist forces, and were the effective counterweight. Everyone let GOP/Libertarian philosophy and talking points get a foothold, and that union power has disintegrated. Reagan made union-busting his first priority, and the air traffic controllers were the object lesson; now people think unions can't do shit. Now Dem blame the unions for shit, when really, they should be built back by anyone with a shred of liberal leaning, because that's where liberal power comes from. Liberals pout when their most favored candidate doesn't survive the primaries, and they complain about how The Man is keeping them down.
Naw, dawg. You're just easily played.