If Bernie Sanders continues to improve his poll numbers and becomes a genuine threat to Hillary Clinton's nomination, undecided Democrats will increasingly hear from Clinton supporters that Mr. Sanders is not electable. Frequently, the electability argument is simply a normal campaign tactic, but it occasionally takes on ugly undertones. In 2008, many Democrats were told that the country wasn't ready for an African-American president and therefore they would be foolish to support Barack Obama. This may not exactly have been a racist appeal, but if not, it was very close.
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