Kansas, Missouri, and Virginia have closed primaries, prohibiting crossover voting; Washington has an open primary allowing crossover. This structural difference makes Washington distinctive: voters from any party can influence major party nominations, while the other three restrict participation to registered party members. No data is provided on turnout rates, median voter age, party affiliation proportions, racial/ethnic composition, education levels, or urban/rural voter distribution for these states. Therefore, beyond primary openness and closure, no other demographic or electoral characteristics can be confirmed as distinctive.
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