From NBC News:

Nearly 70 percent of Americans say they lack confidence that the U.S. will achieve its goals in fighting the terrorist group ISIS, according to a new NBC News/Wall Street Journal/Annenberg poll. The findings come in the wake of President Barack Obama’s national address announcing new measures to combat the Sunni militants.

Pressure is mounting on the U.S. and its allies to cripple the militants, who have waged a brutal campaign across Syria and Iraq. ISIS already has beheaded two American journalists and on Saturday released a video showing the execution of a third Westerner, British aid worker David Haines.

The poll – conducted before the latest execution emerged – showed that a combined 68 percent of Americans say they have “very little” or “just some” confidence that Obama’s goals of degrading and eliminating the threat posed by ISIS will be achieved. Just 28 percent said they had “a great deal” or “quite a bit” of confidence. Still, 62 percent of voters say they support Obama’s decision to take action against ISIS in Iraq and Syria, while 22 percent oppose it.

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