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And the controversial Keystone XL pipeline, whose construction has been delayed over environmental concerns, could now face some competition.

As NPR's John Ydstie reports, two companies have announced plans to build pipelines that would carry out the same service as the XL, channeling oil from Canada's tar sands to refineries in the Gulf of Mexico.

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This is MORNING EDITION from NPR News. I'm David Greene.

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And I'm Renee Montagne.

Foreign ministers of the Arab League are meeting in Baghdad today. It's something of a return to the world stage for the Iraqi capital, marking the first time in two decades Baghdad has hosted this summit of Arab leaders. NPR's Kelly McEvers is there to cover the event and joins us now.

Good morning, Kelly.

KELLY MCEVERS, BYLINE: Good morning.

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Pope Benedict stuck to mostly spiritual themes on a visit to communist Cuba's most sacred shrine. This morning, the pontiff leads a mass in Havana's Plaza of the Revolution. As Nick Miroff reports from Havana, so far even Benedict's gentle push for greater religious and political freedoms for Cubans has been rejected by the government.

Folklorist Alan Lomax spent his career documenting folk music traditions from around the world. Now thousands of the songs and interviews he recorded are available for free online, many for the first time. It's part of what Lomax envisioned for the collection — long before the age of the Internet.

After Tuesday's judicial fireworks, the Supreme Court wraps up arguments on the new health care law Wednesday by focusing on two questions. The first involves what would happen if the "individual mandate" — the core of the law that requires most people to have health insurance — is struck down. Would the rest of the law fall, too, or could some provisions stay?

This year's Final Four seems more like Best in Show at the Westminster. Such pedigree: Kentucky, Kansas, Ohio State and Louisville –– four of the very top dogs in the history of the sport. Well, it's a Meryl Streep kind of year, isn't it?

But if the Final Four might delight fans by giving them aristocracy in its teams, unfortunately the whole of college basketball is plagued by anonymity in its players, and external issues that have diminished the popularity of the game.

Good grief. This year, there has been more buzz about Mad Men than about March Madness.

In its second-to-last argument over the Affordable Care Act, the Supreme Court on Wednesday ponders a what-if.

Specifically, if the justices decide that Congress exceeded its constitutional authority in enacting the part of the law that requires most Americans to either have health insurance starting in 2014 or pay a penalty, does that invalidate the rest of the law? And if not, how much, if any, of the rest of the law should it strike down?