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Democrats Hillary Clinton and Barack Obama debate Thursday for the first time since their bitter contest in South Carolina — and for the first time without John Edwards. Edwards withdrew from the presidential race Wednesday, but he has yet to endorse another candidate.

The Department of Homeland Security will begin asking people crossing into the U.S. by land for passports or other proof of citizenship. Critics predict confusion and many border-area businesses oppose the idea.

How long will U.S. troops occupy Iraq? The Pentagon plans to withdraw some troops between now and mid-summer. A clearer picture will emerge when Gen. David Petraeus briefs lawmakers in April.

Exit polls show Arizona Sen. John McCain is picking up support from pro-choice voters, but his record shows he is consistently anti-abortion. Many voters appear to assume, incorrectly, that abortion is among the issues on which McCain has split with his party.

Microsoft has made a $44.6 billion bid for Yahoo, an aggressive move by the software giant to gain market share on the Internet and compete with Google. Microsoft and Yahoo have talked about merging for years. This time, a hostile but very rich offer could seal the deal.

Arizona Sen. John McCain reinforced his lead among GOP candidates with big wins in California and New York, while results show Democrats Hillary Clinton and Barack Obama with a long fight ahead to win the nomination. Political analysts Stephanie Cutter and Sarah Taylor sort through Super Tuesday results.

The social-networking site Facebook is being used for more than socializing. In Colombia, a Facebook page dedicated to protesting the Revolutionary Armed Forces of Colombia, that country's largest rebel group, is helping organize thousands of people in cities around the world.

The list of nominees for the 80th Academy Awards are announced. No Country for Old Men and There Will Be Blood both earn eight nominations, leading the field.

The economy is emerging as a big issue in the presidential campaign. Presidential contenders in both parties are touting their economic plans for reviving the ailing economy. Upcoming contests will be critical for some candidates.

As Oscar nominees are announced, uncertainty remains over the fate of the annual ceremony. The ongoing writers' strike could short-circuit the awards show.