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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.

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.

The teen-pregnancy comedy Juno received four Oscar nominations Tuesday, including a best actress nod for Ellen Page. Page discusses what it's like being the youngest nominee in the bunch and her future plans.

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.

Scott Simon discusses the significance of the Nevada caucuses and the Republican primary in South Carolina with Senior Washington Editor Ron Elving.

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.

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.

Bobby Fischer, the reclusive American chess master who dethroned the Soviet Union's Boris Spassky as world champion in 1972, has died. He was 64. Fischer died in a hospital in Iceland, where he had lived for several years.

After another day of turmoil in financial markets, the White House and Congress are expressing confidence that they can agree on measures to stimulate the economy. But the plan remains a work in progress.