TY - JOUR T1 - Comment: What Have You Done for Me Lately? Toward an Investment Theory of Voting AU - Popkin, Samuel L. AU - Gorman, John W. AU - Phillips, Charles AU - Smith, Jeffrey A. PY - 1976 SP - 779 EP - 805 JO - American Political Science Review VL - 70 IS - 3 SN - 0003-0554 ER -