Political scientists have attempted to determine why legislators
vote as they do on proposed legislation. An integral part
of this research is how selected demographic characteristics
influence legislators on roll-call votes. Party, region, and
senators' service on the Foreign Relations Committee are found
here to be related to senators' votes on foreign aid legislation,
the issue perhaps most representative of voting on foreign policy
in general. While these relationships are significant in several
sessions of the Congresses studied here, none of them remain
statistically significant throughout the eight sessions of the
four Congresses studied. Even where significant relationships
have been hypothesized here on the basis of past research findings,
findings from the present study do not altogether support earlier
findings. In particular, service on the Foreign Relations Committee
ceases to be a significant determinant in later sessions and
representing Eastern states is the strongest regional determinant.