Tina Richards' son returned, suicidal, from Iraq battlefields. Now, the Missouri woman is waging her own war in Congress.

It is the middle of a winter's night in 2005 when a Marine corporal named Cloy Richards, working guard duty on the graveyard shift at Camp Pendleton, wakes his mother with an anguished phone call.

"Mom, I've got a gun in my mouth, and I'm gonna pull the trigger," Tina Richards recalls her 21-year-old son saying. "I killed too many women and children. I don't deserve a mom and a sister."

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