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One of President Obama's gun control proposals appears to have widespread support — universal background checks for gun purchases. Some experts on mental health and gun violence find problems with the current laws, and they say the system doesn't do a very good job of predicting and preventing gun crime.

When you enter Kerley's Hunting and Outfitting in Cupertino, Calif., you're greeted by a taxidermy lion roaring and leaping. There are rows of rifles on the walls, but the owner, Harry Dwyer III, doesn't appear to be as fierce as his mascot.

President Barack Hussein Obama, sobered but resolute after four years as the nation's first African-American head of state, began his second term Monday with an ardent defense of government as essential to the nation's economic and moral fiber, and a call to citizens to accept their obligation to shape the national debate.

This year, the presidential inaugural events coincide with the holiday honoring Martin Luther King Jr. Host Michel Martin speaks with scholar Clayborne Carson, about how Dr. King may have viewed the historic challenges facing President Obama.

President Obama began his second term with an unapologetically liberal inaugural address, calling on Americans to work together to preserve entitlements, address climate change and extend civil rights.

"Together, we discovered that a free market only thrives when there are rules to ensure competition and fair play," the president said. "Together, we resolved that a great nation must care for the vulnerable and protect its people from life's worst hazards and misfortune."