What moved Trayvon Martin's Feb. 26 death from a local story to a national tale that has sparked a discussion about racial profiling and race relations?

Social media played a critical role. And there were key moments along the way.

Transcript

NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. All this week, the U.S. SUPREME COURT commanded the nation's attention through three days of oral arguments on what may well be its most important case in decades.

The court's ruling could affect the lives of millions, redefine the role and limits of the federal government, and change the character of the 2012 election. We don't expect to know how the justices will rule until late June, but that doesn't stop journalists and legal experts from reading between the lines.

The Louisville Cardinals will face the University of Kentucky Wildcats in the Final Four of the 2012 men's NCAA tournament. The long-time rivalry between these two Kentucky teams is just one example of conflicting team loyalties that can divide families, friends and neighbors for generations.

Everyone loves to hate riding the bus — passengers complain about cleanliness, overcrowding, timeliness and inefficiency. In a piece for Salon.com, writer Will Doig argues that disliking the bus is "practically an American pastime," but buses are key to improving mass transit. Doig thinks that rather than spending money on expensive new systems like light rail or streetcars, cities should focus on making buses better.

The U.S. has been absorbed by the Supreme Court case this week on the future of health care. But Americans are not alone.

Several European nations, where universal health care has been the norm for decades, have been waging their own intense debates as they also deal with aging populations and rising costs.

Britain passed a new health care measure earlier this month, after more than a year of rancorous debate. Can the European experience cast some light on the American debate over health care?

For some people, few things say "Ronald Reagan" like Jelly Belly candy, apparently. Which explains why Rick Santorum will be holding a rally at the California headquarters of the candy maker Thursday.

Santorum is scheduled to attend a "Rally for Rick" event at the Jelly Belly Candy Co. facility in Fairfield, Calif.

Trayvon Martin's death has put a spotlight on Florida's "stand your ground" law. The American Legislative Exchange Council uses that law as a model and encourages other states to adopt it. Host Michel Martin speaks with Lisa Graves of the progressive watchdog Center for Media and Democracy. She says ALEC is fueled by corporate interests.