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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.

The U.S. and Iraq are negotiating an arrangement that would permit U.S. forces to continue to operate in Iraq for many years — possibly decades. Critics says the Bush and Maliki governments are colluding on a deal that would require no legislative approval.

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.

Only a few primaries have happened so far, but already questions are being raised about the reliability of electronic voting equipment. In New Hampshire, two candidates asked for a recount. In South Carolina, some voting machines didn't start up on time.

Thousands of Palestinians in the Gaza Strip flooded into Egypt to buy food and fuel on Wednesday after militants blew up part of a border wall. Supplies have been scarce in Gaza because of an Israeli blockade aimed at stopping rocket attacks. Palestinian supporters are putting pressure on Egypt to keep the passage open.

Democrats in South Carolina chose Sen. Barack Obama as their presidential nominee with record voter turnout. Gwen Ifill of PBS' "Washington Week" and Washington Post political reporter Shailagh Murray discuss Obama's win and the GOP race in the upcoming Florida presidential primary.

The list of nominees for the 80th Academy Awards are announced. No Country for Old Men and There Will Be Blood both earn eight nominations, leading the field.

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.

The economy is emerging as a big issue in the presidential campaign. Presidential contenders in both parties are touting their economic plans for reviving the ailing economy. Upcoming contests will be critical for some candidates.

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.