11.   But there is a political calculus behind this strategy, as well.

12.   But the political calculus is a complex one.

13.   But this political calculus could change dramatically.

14.   Clinton is betting that the moment for peace has arrived because the political calculus has changed.

15.   Finally, the political calculus changed.

16.   For the mayor, too, the political calculus has changed much since last year.

17.   Gramm seems to have been betrayed by his own political calculus as well.

18.   How well Pagan will do is difficult to assess, given the racial and ethnic political calculus of Manhattan.

19.   Indeed, there is a complex and subtle political calculus at work.

20.   In the national political calculus, Texas is often a conservative counterweight to California, which is increasingly liberal.