Do Extremist Voters Dominate Primary Elections?

Do primaries attract more extremist voters who skew elections toward candidates like Bernie Sanders and Donald Trump? The common idea has always been that their extremism makes them more likely to vote in primaries. But political scientist Lynn Vavreck says the real story is far more complicated. Paper: https://www.cambridge.org/core/journals/british-journal-of-political-science/article/on-the-representativeness-of-primary-electorates/06414B6E17368D52B3F77EC9C3BF1520