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Presidential candidate Newt Gingrich points out that he got more delegates from Alabama and Mississippi than Romney.

A beaming Republican presidential candidate Rick Santorum declared he "did it again" and "defied the odds" Tuesday night as he took the stage fresh off his wins in the critical Southern states of Alabama and Mississippi.

Rick Santorum thanks supporters after taking a key Southern victory in Alabama.

President Obama says the nation is heartbroken over a U.S. soldier's alleged killing of 16 Afghan civilians.

The United States, the European Union and Japan are filing a challenge with the World Trade Organization against China's export restrictions on minerals that are crucial for the production of many high-tech devices, President Barack Obama announced Tuesday.

Afghan protesters angered by the weekend killings of 16 civilians blocked a major highway Tuesday as U.S. President Barack Obama said U.S. officials were "heartbroken" by the deaths.

Rick Santorum wins the popular vote in Mississippi and Alabama. John King explains who will win the most delegates.

Anderson Cooper interviews Eric Fehrnstrom, senior adviser to the Romney campaign, as Santorum wins two Southern states.

CNN contributors talk about the impact of Rick Santorum's Southern sweep.

Eric Zillmer says an American soldier's horrific murder of 16 Afghan civilians cannot be explained solely by traumatic brain injury.

First lady Michelle Obama will lead the U.S. delegation to the opening ceremonies of the London Olympics, an administration official said Tuesday.

It's Newt vs. Mitt over cheesy grits. CNN's Jeanne Moos has the nitty gritty on the battle over grits.

President Obama seeks bi-rivalry support, Santorum imbibes in his youth, and Romney, Gingrich tout their love for grits.

Ron Powers says state leaders should be repudiating, not rewarding the offensive radio host with plans to erect a bust of him in the state capital

Sandra Fluke says opponents' smears on her and other women's characters will not silence the voices in support of contraception as a basic health need.

Aaron David Miller says last week's meeting between Obama and Netanyahu was their best yet, but they still differ on many things

President Barack Obama, a well-known basketball fan, will treat British Prime Minister David Cameron to a little March Madness Tuesday as the two head to Ohio to catch an NCAA men's tournament basketball game.

Former Pennsylvania Sen. Rick Santorum swept primaries in Alabama and South Carolina on Tuesday, as southern conservatives again rejected front-runner Mitt Romney and added yet another turn in the 2012 Republican primary story.

In an interview with CNN's Wolf Blitzer, Mitt Romney says that Rick Santorum is "at the desperate end of his campaign."

Conservative bragging rights are on the line in Tuesday's Deep South primaries. CNN's Jim Acosta reports.