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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.

Microsoft's bid to buy Yahoo further demonstrates its desire to compete with Google, which has dominated the Web search industry. But analysts warn that Microsoft and Yahoo each bring flawed Internet strategies to the table, while Google holds a strong hand.

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.

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.

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.

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.

It's Super Tuesday and the biggest primary day in U.S. history with 24 states holding contests. We hear from voters about what issues matter to them.

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.

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.

Actor and former Tennessee Sen. Fred Thompson dropped out of the Republican presidential contest Tuesday. He had said he needed to win in South Carolina, but finished third there. Melissa Block talks with Rich Galen, former senior adviser to the Thompson campaign.