The Gallup Organization asked adults nationwide the following:

In view of the developments since we entered the fighting in Vietnam, do you think the US made a mistake sending troops to fight in Vietnam ?

Yes
No
No Opinion
August 27-September 1, 1965
24%
60%
15%
Sample size: 1,586
January 12-15, 1973
60%
29%
11%
Sample size: 1,549

In this example, seven and a half years of sustained military action and rising casualties certainly changed some minds.

 

Example 2 – ‘Rally around the President’