In a final day of campaigning before Super Tuesday, Republicans Mitt Romney and Rick Santorum focused on the economy in Ohio, the most sought after prize in the 10 states voting or caucusing.

A week ago, Santorum had a substantial lead in Ohio polls; now he's in a statistical dead heat with Romney.

The U.S. Supreme Court said Monday that it will hear reargument next term in a major human rights case, raising the specter that the justices might reverse a 2004 ruling that allowed some lawsuits in U.S. courts for human rights atrocities committed abroad.

In a speech today, Attorney General Eric Holder explained the Obama administration's rationale for using lethal force against Americans who join al-Qaida.

NPR's Carrie Johnson reports that in a speech at Northwestern University Law School, Holder said the issue is one of the most serious he faces. Carrie filed this report for our Newscast unit:

"Eric Holder says U.S. citizens who take up arms against their own country deserve due process under the Constitution.

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For the first time, Idaho Republicans are holding presidential preference caucuses on Tuesday. Jonathan Parker, the state party's executive director, is excited about the chance to hold party-building exercises on such a broad scale.

"For the first time, maybe ever, Idaho is relevant in the nominating process," he says.

But as much as he relishes the attention — Mitt Romney held a rally in Idaho Falls last Thursday — Parker worries that the state GOP could generate the wrong kind of publicity.

Concussions are not kids stuff.

Even a pretty small knock to a child's head can lead to problems for months afterward, a new study finds.

Researchers charted the progress of more than 250 kids admitted to two hospitals for either mild traumatic brain injuries or broken bones in an arm or leg.

The kids who had brain injuries — especially ones that led to unconsciousness or visible changes on MRI scans — were more likely than the others to have headaches, tiredness and trouble thinking a year after being seen at the hospitals.

Two British men have been arrested and charged with stealing Michael Jackson's entire music catalog. Wired estimates the collection is worth around $253 million. That's what Sony Music paid for the catalog following the King of Pop's death.

The two men allegedly hacked into Sony's internal music sharing system and stole the catalog, which also included a wealth of previously unreleased material.

The last time Morning Edition spoke with K'naan, he had just gone back to his native Somalia for the first time in 20 years to highlight the effects of the famine there.