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(CNN) -- One in five Americans believes the United States is winning the war in Iraq, according to a poll. The number has dropped by half since December.
About the same number -- 18 percent -- believe insurgents are winning. But the majority, 60 percent, say no one is winning in Iraq.
The poll of 1,013 adult Americans interviewed by telephone found two-thirds -- 64 percent -- of those polled oppose the war in Iraq.
A majority, 57 percent, want the United States to announce it will pull all troops by a certain date. The Bush administration argues against setting a timetable, saying it would embolden the enemy. But the onslaught of daily violence has apparently soured public support for the war.
Conducted over the past three days by Opinion Research Corp., the poll also found increased pessimism for the "war on terrorism." Sixty percent are dissatisfied with the way things are going for the United States in that effort, up from 53 percent in September.
The sampling error for all questions is plus or minus 3 percentage points.
With two weeks to go before November's midterm elections, 51 percent of those polled believe Democrats would do a better job on Iraq, while 40 percent said Republicans would.
Forty-eight percent said the GOP would do better on terrorism, up from 40 percent earlier this month. Forty-two percent said Democrats would do better on terrorism.
Most of those polled don't believe the chances of a terrorist attack against the United States would change if Democrats gain control of Congress. Fifty-eight percent said there would be no change, while the rest were evenly divided over whether the chances would increase or decrease.
A file image shows an Iraqi insurgent. Eighteen percent of those polled said the insurgents are winning the war.