Sometimes a race is not about who win (like perhaps in this case), but about perception and expectation. If Hillary win only by one digit margin in NY, it would shatter the assumption that she's untouchable, and may alter her status as 'front-runner' in Democratic primary
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While I agree that expensive TV ads late in a campaign when a nominee is 20 points behind are a waste of money, early funding and support of the national party are important. I also like forcing Hillary to spend money.
So, I agree with you.
With a Republican governor and Republican mayors in NY I don't think this is such a blue state. Anyway, there is a red state inside every blue state and visa versa. What I do worry about is the antique, very fixable voting machines in NYC.