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As Mitt Romney and Rick Santorum battle for first place in the Michigan GOP presidential primary, rival Ron Paul is not expected to come in first or second. Paul doesn't really stand a chance at winning the nomination, but he can impact the party's platform

The race for the Republican presidential nomination enters another crucial week, with contests Tuesday in Arizona and Michigan. Rick Santorum is tied nationally with Mitt Romney in a new national poll of Republicans.

Also: Yemen's Saleh hands over power to hand-picked successor; WikiLeaks starts releasing security firm Stratfor's emails; gunfire breaks out at an Ohio high school.

Violent protests marked the run-up to Sunday's first round of presidential elections in Senegal. Unofficial vote counts indicate a possible run-off between incumbent President Abdoulaye Wade and a former prime minister. Critics say Wade's third term bid is unconstitutional, and they are concerned about corruption and the high cost of living. Host Michel Martin checks in with NPR's West Africa Correspondent Ofeibea Quist-Arcton.

It was the first time an aid group had gone into the besieged city of Hama in more than a month. Teams delivered food and other aid for 12,000 people.

Human papillomavirus can cause cervical cancer. And girls have been the prime focus for vaccination, though that has stirred controversy almost from the start. Now pediatricians says vaccinating boys could curb illnesses tied to the virus.

Rick Santorum tried to outflank Mitt Romney on a fairly sensitive issue in Detroit: government bailouts. Santorum blasted Romney for supporting the government's Wall Street bailout while loudly opposing the auto industry bailout.

Restaurants that cater to the affluent in India are forgoing vegetables in return for ever increasing amounts of meat. Commentator Sandip Roy describes what it's like for a lifelong vegetarian to be confronted with chicken kebabs, mutton biryani and lamb shanks.

Republicans in Wyoming pick delegates for the national convention in a process that stretches from early February to mid-April.

On Tuesday, the U.S. Supreme Court hears two cases testing how American law intersects with international law. One case involves a lawsuit against Royal Dutch Shell Oil, which is accused of aiding and abetting the Nigerian government in committing atrocities in the 1990s.