Ari Shapiro

President Obama's time in office has not been defined by terrorism as President George W. Bush's was. Yet incidents like the one in Boston have been a regular, painful through line of his presidency.

When a new administration walks into the White House, nobody provides a handbook on how to respond to a terrorist attack. So the Obama administration has been on a steady learning curve.

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MELISSA BLOCK, HOST:

This week marked a new step in Michelle Obama's evolution as first lady. In her hometown of Chicago, she delivered one of the most emotional speeches of her career — about kids dying from gun violence.

"I'm not talking about something that's happening in a war zone halfway around the world," she said. "I am talking about what's happening in the city that we call home."

Republicans don't often make high-profile speeches at Howard University, one of the country's most prominent historically black schools. But on Wednesday, Kentucky Sen. Rand Paul will talk to Howard students about how his party can be more inclusive.

Paul believes one answer is libertarianism — and party leaders are starting to think he might be on to something.

President Obama will visit Connecticut on Monday to keep pushing for new federal gun laws. The poster children for this campaign are just that — children.

The president has invited kids to the White House to watch him sign new executive orders on guns. And the images of the kids who died at Sandy Hook Elementary School are a constant reminder of the toll gun violence can take.

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