What’s going on with the Sanders / Warren crossover vote?

In short: we don’t know. Because to measure this directly, you would need to ask respondents “have you switched from Sanders to Warren, or vice versa?” – and no one is actually asking this. There is, however, an indirect way to look at this: ask voters who their second choice is. If we then suppose that first choice votes are “stolen” from a respondent’…

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