It’s a difficult balance. Hillary +4 would be more credible. Hillary +50 would have better impact but give away the game. They opt for Hilary +12 which has good propaganda value while not too much risk of giving the game away...but they lost. The game has been given away.
Hillary is not going to get a better turnout than Obama.
Her rallies are sparsely attended.
D +9 certainly holds up - in an alternate universe.