Rush was just talking about this. 90% of their money comes from a handful of wealthy kooks in the Bay Area and Upper Manhattan. They can either take the money or reposition the party to be more palatable to voters, not both.
It seems they think that money is everything. Look at the fortune Hillary spent, and all the money they poured into Georgia 6. The party of the people thinks they can buy electoral victory.
Then compare that to the relatively small amount spent by Trump. (Of course, he had all that Russian help, too.)