Legislative professionalization typically involves two concomitant processes: increasing institutional resources and increasing careerism among state legislators. These processes, we argue, entail different effects for legislative influence on state administrative agencies. Greater legislative resources serve to increase legislative influence, but greater political careerism among state legislators serves to decrease it. Because these two processes are normally intertwined within the process of legislative professionalization, the net effect of professionalism is uncertain, although our analysis suggests that the negative effect of careerism may outweigh the positive effect of institutional resources. These results have significant implications for the democratic responsiveness of executive branch agencies.