Protesters chant and hold a copy of the Declaration of Independence and the Constitution in front of Supreme Court in Washington as the court concluded three days of hearing arguments on the constitutionality of President Barack Obama's health care overhaul. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

Florida State Attorney Angela Corey (center) has been assigned to lead the investigation into the shooting death of Florida teenager Trayvon Martin. Kelly Jordan/The Florida Times-Union hide caption

itoggle caption Kelly Jordan/The Florida Times-Union

Former MF Global Holdings Ltd. Chairman and CEO Jon Corzine testified on Capitol Hill in December. On Wednesday, a former executive at the company refused to answer lawmakers' questions about events in the run-up to the firm's collapse. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

Linda Dorr (left) and Keli Carender chant along with other demonstrators in front of the Supreme Court on Wednesday. John Rose/NPR hide caption

itoggle caption John Rose/NPR

Tracy Martin says of his son, "We're not saying that Trayvon was perfect. But what we are saying is, he was our child. He was a good kid. And he didn't deserve death." Doriane Raiman/NPR hide caption

itoggle caption Doriane Raiman/NPR