Not only was the figure the highest level of opposition to the Iraq war by one percentage point, but it was the highest ever "mistake" recorded by Gallup in any active war, including Vietnam, by two points.

Princeton, N.J.-headquartered Gallup said its returns showed an inconclusive answer as to whether Iraq or Vietnam was the most unpopular war. While more respondents thought Iraq was a mistake (63 percent), more thought it was not a mistake (36 percent) than did those favoring the Vietnam fighting (28 percent).

Results are based on telephone interviews with 1,016 adults, aged 18 and older, conducted April 18-20, and had an estimated margin of error of 3 percent, Gallup said.