President Barack Obama urged Americans to keep calm in the wake of Saturday's jury verdict finding George Zimmerman not guilty of charges associated with the controversial shooting death of black teen Trayvon Martin. "I know this case has elicited strong passions. And in the wake of the verdict, I know those passions may be running even higher," Obama said Sunday in a statement. "But we are a nation of laws, and a jury has spoken. I now ask every American to respect the call for calm reflection from two parents who lost their young son."