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I think HRC's secret weapon are disabled voters and their families--that they are not addressed in polls, but they are a very large group (60 million!), one with which HRC has both a positive record over time and positive policies, and Trump's stunning lack of empathy. I also think the polls undercount Latinos and younger voters.
Anyhow, folks will have other priorities if Trump wins, but this is out there so that you can criticize me if I am wrong. But I will not be.