Proponents of vote by mail elections often argue that this type of election facilitates participation such that elevated levels of turnout occur. The research tests this assumption by analyzing 44 statewide elections (1980–2007) in the state of Oregon—the only state that conducts all of its elections by mail. The results of this analysis suggest that the vote by mail format is a major stimulus to voter participation in special elections in Oregon, while its effect on turnout in primary and general elections is positive, but fairly minimal.