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Three leading Republicans are competing hard for delegates in the large industrial state. Mitt Romney hopes to trade on the legacy of his late father, a former Michigan governor. John McCain hopes to capitalize on a bounce in the polls after his New Hampshire win, while Mike Huckabee seeks support from evangelicals.

Health insurance is turning into a top-tier issue in this year's presidential campaign. We asked the presidential hopefuls about their own coverage — and that of their staffs. Not everyone was talking.

Armed militants attacked the Serena Hotel in Kabul on Monday, killing eight people. Now the Taliban is threatening more violence against Westerners. Lisa Gans is waiting to "crack" following a close encounter with the explosion.

From Bill Clinton to Martha Stewart, many successful people brag about how little sleep they need. But sleep researchers say some people sneak in some extra shut-eye during the day, and the truly sleep-deprived usually pay a price.

Record turnout is expected for Saturday's Democratic caucuses in Nevada, where candidates are hoping to show their clout in the party's first western nominating contest and the first state contest with a significant minority population.

It will be a few years before Chinese cars are selling in U.S. showrooms, but their presence at the North American International Auto Show in Detroit is creating quite a stir. Five Chinese auto-makers are represented, sending a clear signal that China is setting its sights on the lucrative American market.

Yahoo Inc. has rebuffed an unsolicited $44.6 billion takeover offer from Microsoft Corp., an offer Yahoo said "substantially undervalues" the company. Microsoft is now expected to sweeten its bid, which valued Yahoo stock at $31 a share.

University of Michigan professor Arthur Kuo's research team has created a new knee brace that stores the residual energy a person makes while walking. They report that walking for one minute can generate enough energy to power the average cell phone for 10 minutes. Andrea Seabrook speaks with Kuo.

The "magic number" of delegates needed to clinch the Democratic presidential nomination is 2,025. But neither Hillary Clinton nor Barack Obama is close to that number. If that continues, the party's 796 superdelegates may decide the Democratic race.

With a close Democratic race for the presidential nominee, the role of delegates and super delegates could become increasingly more important leading up to the Democratic National Convention in August. Former Democratic strategist David Sirota and political legal analyst Stanley Brand explain why superdelegates are important.