With the stroke of a pen, Alabama's Gov. Robert Bentley signed into law this week a bill described on all sides of the immigration debate as the toughest enforcement measure in the country to date.

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In other news Thursday, Newt Gingrich's bid for the GOP 2012 nomination suffered a major blow when his campaign manager, senior staff and key aides in early primary states all resigned, but the candidate pledged to stay in the race.

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'Freedom Riders' Reenacts Historic Bus Trip Across South…

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Jeffrey Brown talks to Birmingham Chief of Police about the deadly tornadoes.

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As the large amounts of oil continue to foul the Gulf of Mexico, scientists have begun using microbes to help clean affected marshlands. Tom Bearden reports.

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As the remnants of Hurricane Alex dissipated over Mexico, a bigger influx of crude from the churning waves washed onto Gulf shores. Correspondent Tom Bearden reports from Alabama, where beaches and nearby businesses now sit nearly empty.

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Gwen Ifill remembers civil rights activist Dr. Dorothy Height, who was a leader in both the African-American and women's rights movements. She died Tuesday at age 98.

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In other news, stocks rose slightly Friday despite news that the economy shed 85,000 jobs in December, and the FBI arrested two men suspected of planning terror attacks in New York.

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Jeffrey Brown examines first lady Michelle Obama's ancestral path as the descendant of a slave.

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A bronze statue of Helen Keller was unveiled to Congress Wednesday. Kwame Holman reports.

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