Evidence for social influence in politics is usually based on examinat
ion of standard political science dependent variables such as vote cho
ice, rather than more deeply felt personal and emotional ones like opi
nion on abortion. This paper develops a system of simultaneous equatio
ns that explicitly models the process of influence on abortion attitud
es among pairs of political discussants. The results suggest that, in
addition to other things, the way the influence process works may depe
nd on the type of attitude being examined.