21.   It is difficult to find a political calculus in which that adds up to a Congress more rather than less likely to do anything serious about health care.

22.   Meantime, worries about chemical terrorism have grown, primarily out of fear of nihilistic terrorist organizations more driven by destruction than political calculus.

23.   So, Sanchez as a candidate will force big changes in the political calculus up and down the ballot and across parties.

24.   Such sentiment no doubt weighs heavy in his political calculus.

25.   The drop in the stock market and signs of a faltering economy have clearly changed the political calculus on tax legislation.

26.   The political calculus made it an inside-the-Beltway power struggle rather than a national referendum on whether free trade is a good thing for most Americans.

27.   The political calculus used to make that distinction is often influenced by matters of race, power politics, and a need to preserve American credibility, specialists said.

28.   The political calculus for both parties is changing along with the economic outlook.

29.   The political calculus has often favored a defensive approach to addressing these issues.

30.   The political calculus also favors action.