Film-maker Michael Moore has warned the Democratic National Convention that US Republicans "are not going to go peacefully" from the White House.
Moore was an unofficial speaker at the four-day Democratic convention
Democrats queued for up to five hours to see Moore, whose documentary movie Fahrenheit 9/11 criticises President Bush's war with Iraq.
Moore's address at the Boston convention drew up to 2,000 people.
Democratic candidate John Kerry would not become US president by being "weak-kneed and wimpy", Moore said.
Moore spoke to a packed hotel ballroom during the four-day convention, which received official speeches by Bill Clinton and the presidential candidate's wife, Teresa Heinz Kerry.
"The unelected side who occupy the White House - they are not going to go peacefully," Moore said, referring to George Bush's disputed 2000 presidential election victory.
"They are better fighters than we are. They are up at six in the morning trying to figure out which minority they are going to screw today.
"Our side, we never see six in the morning, unless we've been up all night."
Moore said he forgave John Kerry's 2002 support for the Iraq war
He called the president and his allies "hate-riots, not patriots" and said the US media failed to ask tough questions about Bush's decision to invade Iraq in 2003.
Claiming journalists had been "cheerleaders" for the war, Moore said: "You haven't just been embedded - you've been in bed with the wrong people."
Moore said he "forgave" John Kerry's 2002 vote in the Senate in support of the war against Iraq.
He said Kerry's "only real sin" was to believe what President Bush had said at the time.