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Thousands of motorists had to present proof of citizenship Thursday for land-based border crossings. Federal authorities gave plenty of notice about the new law requiring identification, but were prepared for lots of confusion. It went surprisingly smoothly, we find.

Former Arkansas Gov. Mike Huckabee won the Republican presidential nominating event in West Virginia Tuesday, claiming all 18 delegates at stake at the party's convention-style statewide caucus. Former Gov. Mitt Romney had led after the first round of voting. After that first round, Sen. John McCain's supporters threw their support to Huckabee to prevent a Romney win.

Microsoft's first priority in its unsolicited bid for Yahoo is to compete with Google for advertising revenue that comes from online searches. But the merger would bring a lot of other goodies, too.

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.

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.