"I've been wondering why I'm killing myself and wondering why the Democrats caved in to George Bush," Sheehan told The Associated Press while driving from her property in Crawford to the airport, where she planned to return to her native California.
"I'm going home for awhile to try and be normal," she said.
In what she described as a "resignation letter," Sheehan wrote in her online diary on the Daily Kos blog: "Good-bye America ... you are not the country that I love and I finally realized no matter how much I sacrifice, I can't make you be that country unless you want it.
"It's up to you now."
Sheehan began a grass roots peace movement in August 2005 when she camped outside Bush's Crawford ranch for 26 days, demanding to talk with the president about her son's death. Army Spc. Casey Sheehan was 24 when he was killed in an ambush in Baghdad in 2004.
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When Sheehan first took on Bush, she was a darling of the liberal left. "However, when I started to hold the Democratic Party to the same standards that I held the Republican Party, support for my cause started to erode and the 'left' started labeling me with the same slurs that the right used," she wrote in the diary.
She said she sacrificed a 29-year marriage and endured threats to put all her energy into stopping the war. What she found, she wrote, was a movement "that often puts personal egos above peace and human life."
She said the most devastating conclusion she had reached "was that Casey did indeed die for nothing ... killed by his own country which is beholden to and run by a war machine that even controls what we think."
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