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Mitt Romney won six of the 10 Super Tuesday contests. Rick Santorum won three while Newt Gingrich won one. Ron Paul was the only candidate who did not win at least one contest.

President Obama held a wide-ranging news conference Tuesday. He bluntly challenged Republican critics of his Iran policy — saying the stakes are too high to let politics intrude. The news conference was designed to steal some of the spotlight from GOP presidential hopefuls on Super Tuesday.

Wind power is all the rage in Oklahoma and could be a boon in a state that has been hit hard by unemployment. The problem is finding qualified people to work in the industry.

Tina Brown, editor of The Daily Beast and Newsweek, tells us what she's been reading in a feature that Morning Edition likes to call "Word of Mouth." This month, Brown selects two pieces of writing profiling individuals at the center of political change in their respective countries.

A Penetrating New Profile Of Russia's Putin

When the state of California added the compound 4-methylimidazole, also known as 4-MI or 4-MEI, to its list of known carcinogens in 2011, it created a problem for the soda industry.

The caramel color they used to give colas that distinctive, brown hue contained levels of 4-MI that would have warranted a cancer warning label on every can sold in the state.

Nearly four years ago, the bank collapsed in the biggest bankruptcy in U.S. history — a record $639 billion. That set off a chain reaction and sent the economy spiraling. Lehman Bros. says now, it will continue to liquidate its holdings, and will start paying back creditors next month.

Rebekah Speight spotted the familiar profile on a McNugget left on her child's plate. After stashing it in the freezer for three years, she auctioned it off on eBay. Her church's summer camp will benefit from the winning $8,000 bid.

Navy Secretary Ray Mabus says he wants personnel to adapt to the 21 century. He announced the Navy will give sailors breathalyzer tests and drug tests before they report to duty on a ship. The Marines will adapt a similar program next month.

Republican presidential candidates have a chance to win hundreds of convention delegates after voters cast their ballots in Super Tuesday contests. The delegate count wouldn't be enough for any candidate to clinch the nomination, but it would help. Mitt Romney is hoping to return to front-runner status but Rick Santorum, Newt Gingrich and Ron Paul are trying to prevent that.

Morning Edition has four reports on Monday's campaigning leading up to Super Tuesday's 10 primaries and caucuses.

NPR's Don Gonyea was traveling with former Senator Rick Santorum in Ohio.