Move to the left, continue to stress the historic nature of having the first ever female president and argue on electability. She should definitely NOT go negative however, that will only make her look like a sore loser and will have a much more negative impact on her than on Sanders. It will also make the eventual nominee weaker as a result.
People always say you shouldn't go negative. No one likes the idea of "going negative" in the abstract. Just like no one likes raising taxes. But it works. The best moment of her 2008 campaign, besides pulling out New Hampshire, was arguably her Mark Penn-inspired 3 AM ad. Bernie doesn't have to go negative on her because there are already lots of people doing it (including his own supporters). But no one is going negative on Bernie, so she's going to have to do it, even though the blowback will be huge.
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