President Bush's Democratic rivals are seizing on today's shootdown of the Chinook transport helicopter that killed 15 soldiers and injuring 21.
They're pressing the administration to justify the mounting American death toll and to explain its strategy for getting out of Iraq.
Former NATO commander Wesley Clark told The Associated Press: "We were misled into this conflict without a real strategy for success."
Two other candidates, Congressman Dick Gephardt and Senator John Edwards, said the United States needs more international help in making Iraq safe.
Dennis Kucinich, the only candidate who voted against the resolution authorizing the war, said in a statement: "This disastrous mission must be ended before any more lives are lost. ... It is time to bring our troops home."