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In Washington state, we have a Democratic primary and caucus, but delegates are determined based on the caucus only. I don't like this at all, but we can later see if there is a major discrepancy between the primary and caucus results. If anything, caucuses tend to favor party insiders (i.e., Senator Clinton supporters).
Someone wrote that caucuses discriminate against "Hillary's People" (Elderly, women, and Latinos) because they are held in the "evening". In Washington state, our caucuses were held between 1 and 3 pm. There were many seniors, women, and Latinos there - the vast majority of them supporting Barack Obama. Today's sweep appears to be a real movement, not the result of some biased sample.