This Feb. 26, 2012 photo shows a single bullet casing from the Kel-Tec PF-9 9mm handgun used by George Zimmerman, the neighborhood watch volunteer who shot Trayvon Martin. The photo and reports were among evidence released by prosecutors that also includes calls to police, video and numerous other documents.  (AP Photo/State Attorney's Office)

Facebook founder, Chairman and CEO Mark Zuckerberg, center, applauds at the opening bell of the Nasdaq stock market, Friday, May 18, 2012, from Facebook headquarters in Menlo Park, Calif. The social media company priced its IPO on Thursday at $38 per share, and beginning Friday regular investors will have a chance to buy shares. (AP Photo/Nasdaq via Facebook, Zef Nikolla)

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Kathy Watson, a cancer patient who also runs a medical transport company, voted Republican in 2008 and believes the government has no right telling Americans to get health insurance. Nonetheless, she says she’d be dead if it weren’t for President Barack Obama’s health care law. (AP Photo/David Goldman)

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Miami Heat's LeBron James (6) and Dwyane Wade, right, leave the court after losing 94-75 to the Indiana Pacers in Game 3 of their NBA basketball Eastern Conference semifinal playoff series, Thursday, May 17, 2012, in Indianapolis. (AP Photo/Darron Cummings)