WASHINGTON (AP) - President Barack Obama has signed an extension of the Social Security payroll tax cut through the end of the year.

WASHINGTON -- It was first proposed by black Civil War veterans almost 100 years ago.

PHOENIX -- Mitt Romney, Rick Santorum, Newt Gingrich and Ron Paul will square off in the final GOP debate before Super Tuesday.  The debate tonight could have major implications for the Michigan primary.

LINCOLN, Neb. -- Leaders of an American Indian tribe in South Dakota who
are suing beer makers, distributors and retailers are now asking a
judge to limit alcohol sales in a tiny Nebraska town that borders their
reservation.

BUENOS AIRES, Argentina -- Officials say a packed train has slammed into the end of the line in Buenos Aires' busy Once station, killing 49 people.

WASHINGTON -- Treasury Secretary Timothy Geithner unveiled President
Obama's business tax plan this morning that would lower the corporate
tax rate from 35% to 28%.

DETROIT -- Federal safety regulators are investigating a problem with side air bags that may fail to inflate in a crash.

PHOENIX - Former Pennsylvania senator Rick Santorum on Tuesday criticized a report about a 2008 speech in which he said "Satan has set his sights on the United States of America."

NEWARK, N.J. -- New Jersey Gov. Chris Christie says Rick Santorum's 2008
comments about Satan targeting America are indeed relevant to the GOP
presidential race.

WASHINGTON -- Five wealthy people, led by Dallas industrialist Harold
Simmons and Las Vegas casino mogul Sheldon Adelson, have donated nearly
$1 of every $4 flowing to the super PACs.

CAIRO -- Egypt's ousted President Hosni Mubarak has turned down the
chance to address the court on the last session before the verdict in
his seven-month trial.

NEW BRUNSWICK, N.J. -- Not far from Rutgers University, all eyes have turned to a second-floor courtroom where "cyberbullying" has taken center stage.

KABUL, Afghanistan - Afghan officials say at least three people have
been killed after police opened fire to disperse thousands of
anti-American demonstrators rioting for a second day.

BRUSSELS -- The European Commission, facing steep opposition, is
suspending efforts to ratify an international anti-counterfeiting
agreement and instead referring it to Europe's highest court to see
whether it violates EU rights.

BUENOS AIRES, Argentina -- A packed train has slammed into the end of
the line in Buenos Aires' busy Once station, injuring hundreds of
morning commuters.