US Public on the Use of Force
From: Christopher Gelpi, Peter D. Feaver, and Jason Reifler, "Success Matters: Casualty Sensitivity and the War in Iraq" International Security Winter 2005/06, Vol. 30, No. 3: 7-46
Fig. 2 (below) measures the change in the probability that someone will tolerate 1500 US deaths in the Iraq war based on whether the respondent expects success and whether the respondent believed the war was right or wrong.
Table 5 (below) shows the magnitude of other factors on casualty tolerance.
Another study by Richard Eichenberg, "Victory Has Many Friends," International Security Vol. 30, No. 1 (Summer 2005), pp. 140–177 finds a different set of factors affecting support for use of force in general. He is examining a variety of surveys, not just ones on teh Iraq war.