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Summertime ice in the Arctic Ocean has been in quick retreat. There's a lot of uncertainty about how quickly it will melt away entirely in the summertime. Estimates range from 2013 to beyond 2100. The uncertainty is explained by the science behind the phenomenon of melting.

Republicans had their turn last week in South Carolina. On Saturday, the Democrats have their say. Barack Obama, Hillary Clinton and John Edwards are making last-minute appeals to the voters of the Palmetto State, but the stakes are perhaps higher for Obama and Edwards.

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

Sen. Hillary Clinton and Sen. Barack Obama sparred Monday night at a Democratic debate in Myrtle Beach, S.C. Each accused the other of deliberately distorting the truth for political gain.

Conversations with voters in South Carolina reinforce suspicions that Sen. Barack Obama is having trouble attracting support from white Democrats. He has strong support among blacks, who make up about half the state's Democrats.

Former President Bill Clinton is brushing off criticism that his campaign-trail rhetoric unfairly targets Sen. Barack Obama. Obama has complained that he's not sure who he is running against: Sen. Hillary Clinton, her husband, or both.

On Monday, Kansas Gov. Kathleen Sebelius will respond to President Bush's final State of the Union address. Working in a Red State, she's spent years learning how to get along with her political opponents.

In Kenya, a funeral for opposition members killed in the violent political crisis dissolved in fumes of tear gas as police battled stone-throwing youths. The latest violence came as former U.N. Chief Kofi Annan began talks to try to resolve the post-election stalemate that threatens what had been East Africa's most stable nation.

President Bush is preparing to address the nation in the final State of the Union address of his presidency. White House Counselor Ed Gillespie explains what to expect — and what not to expect — from the speech. Gillespie also provides an update on the bipartisan economic stimulus package currenltly working its way through Congress.

A "declaration of principles" that sets the foundation for the future of America's involvement in Iraq is raising questions on Capitol Hill about how long the U.S. commitment there will last.