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Seriously. If she believes that she is the best qualified candidate and if she believes she can win the Presidency with 18 million votes in her projected "path to victory", then by all means, she should keep running for President. But at this point, she won't be the Democratic nominee, so she needs to run as an Independent, just as Joe Lieberman did when he failed to secure the Democratic nomination for Senator of Connecticut. He went on to win the election. If Hillary wins enough electoral votes, then she will win fair and square.
I wonder if that's what she has in mind, since she didn't say she was quitting the race?