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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.

People have been avoiding checked-baggage fees by carrying on bags — that includes bags too big for the overhead bins. Now United and Delta Airlines are enlarging the bins. There is some fear, however, this will prompt people to bring bags that are even larger.

Russia's opposition is turning to the streets to protest Sunday's presidential election which returned Vladimir Putin to power. The protesters may have agreed on a set of very catchy slogans, but they're not a cohesive political movement.

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OK. And we all noticed rising costs at the gas pump. But those costs will also mean rising prices for airline tickets.

As NPR's Annie Baxter reports, that's already happening.

ANNIE BAXTER, BYLINE: If you've been looking for a great deal on airline tickets recently, you've probably been disappointed.

BOB MANN: Carriers have raised prices successfully twice, so far this year and that's out of four attempts. And I would expect another attempt literally within in a week.

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NPR's business news starts with more positive signs for the economy.

The U.S. economy is improving faster than previously predicted. This, according to two dozen economists surveyed by the Associated Press. The economists foresee stronger growth and more hiring than they did two months ago, and predict an unemployment rate at around eight percent by Election Day.