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One year after 17-year-old Trayvon Martin was shot and killed by an armed neighborhood watchman, setting off a national debate about race and gun laws, the campaign to change state self-defense laws in Martin's name has petered out.

George Zimmerman, the neighborhood watch volunteer facing second-degree murder charges, said he shot Martin in self defense last Feb. 25 after he decided to follow him in the Sanford, Fla., gated community because Martin looked suspicious. Zimmerman called the police and then approached Martin, and they ended up in a physical fight. Zimmerman, saying he feared for his life, then shot Martin. He was not charged with a crime for several weeks, and his defense attorneys argue he's immune from prosecution under Florida's "stand your ground" law.

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