From the Washington Post/ABC Poll the night after the bombing:

Would you be willing to give up some of the
liberties we have in this country in order
for the government to crack down on terrorism,
or not?

           Would be    Would not       No
           willing     be willing    opinion
9/11/01      66           24           10
5/14/95      52           41            7
4/20/95      59           35            7

Of course, as the Post says, “Results of overnight polls that attempt to measure opinions about fast-changing news events should be interpreted with extra caution”.