For those who subscribe to the theory of ldquo;responsible parties,” party platforms should offer voters a basis for choosing between the parties and give politicians the basis for a mandate. As Krehbiel points out, U.S. platforms are routinely dismissed as “amorphous” and “hardly ever … (serving) effectively as constraints during the campaign or after the election.” Yet, for better or worse, party platforms are the only authoritative statement of national party positions available, so political scientists have frequently used them as a basis for studies of party policymaking. Contrary to expectations based on the stereotype of “irresponsible” U.S. parties, studies by Gerald Pomper, Jeff Fishel, and others show that U.S. parties make fairly specific policy promises and are able to carry most of them out, even under the adverse condition of divided government. Cross-national studies show that although U.S. parties are not as successful as parties in parliamentary regimes, they look surprisingly good in international comparisons.