What the author does not understand is that driving out a group can easily cause the attraction of another disaffected group. Dumping the Mitt Romney-Nelson Rockefeller-Bush family Republicans makes an opening for pro-gun, pro-life Democrats that are just turned off by what they perceive as the Plutocratic face of the Republican party. When the expelled Demons wander in the deserts to, looking for a new home, some Dems will take the bait (money), and cause the same internal divisions inside the Dem party as they become the crony socialist-party with the crony-capitalist face.
But the Dems aways unite in the general election — you don’t see Dem factions feuding and staying home, which is quite usual for GOP and conservative voters.
That’s how Dems get elected in the first place — GOP division results in just enough GOP voters staying home or voting third party to allow the Dems to win.
That’s how Obama got elected twice and that’s how the GOP didn’t capture the Senate the last time and may not do it this time.