The bill-passage success of women and men legislators in professional and in citizen state legislatures is evaluated using a path analytical model. The model consists of exogenous personal, institutional, district, and state-level variables, an intervening variable of legislative leadership positions, and the direct and indirect effects of these variables on bill-passage success. With data from a 2004 survey of all fifty lower state houses compared to a similar 1992 nationwide survey of state legislators, women legislators display increased legislative positions and bill-passage in both professional and citizen state legislatures. The model predicts that institutional factors and, to a lesser extent, personal attributes are essential components for acquiring legislative positions as well as bill-passage success for women and men in both types of legislatures.