Although assertions chat 'domestic politics matters' an: common, it is
not always recognized that theorists can assign a range of different
roles to domestic factors. This article seeks to demonstrate that much
research on domestic variables overlooks a potential role of social p
rotest. Focusing on studies of cooperation and arms control, this arti
cle shows that they Frequently either treat domestic politics only as
a source of constraints that explain failures of cooperation, or view
the public as purely reactive to efforts by state leaders to use inter
national cooperation to blunt the impact of domestic problems. An anal
ysis of US willingness to enter strategic arms talks during the Cold W
ar suggests that this view of domestic policies is too narrow. A multi
variate statistical analysis, supplemented by case-study evidence, sho
ws that protest against nuclear weapons was a significant source of US
decisions to seek strategic arms control. This suggests that theories
that incorporate domestic factors need to allow for the possibility t
hat public activism can contribute to changes in state preferences in
the direction sought by activists, including a preference for security
cooperation.