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Microsoft has plenty of reasons to want to acquire online giant Yahoo — 80 billion reasons, in fact. Online ad revenues are expected to double by 2010, reaching $80 billion, and Microsoft is eager to get into the game — if for no other reason than to slow rival Google's historic growth.

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.

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.

California has the most votes at stake on Super Tuesday, but counting those returns could take a lot longer than usual. Electronic voting machines in more than 20 counties there have been scrapped because of security concerns. Now those counties are using old-fashioned paper ballots instead.

The death toll from tornadoes that tore through the South continues to rise Wednesday, as authorities prepare to go door-to-door to search for victims. Fay Graves, who manages a McDonald's restaurant in Jackson, Tenn., describes the destruction.

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.