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The candidates' appearances will all be streamed online.

"Today we focus on Afghanistan, but the battle is broader," the president said. And he added that "we will not waver; we will not tire; we will not falter; and we will not fail. Peace and freedom will prevail."

The 2011 Nobel Peace Prize winners were named Friday: Yemeni activist Tawakkul Karman, Liberian president Ellen Johnson Sirleaf and Liberian activist and author Leymah Gbowee. Michel Martin discusses the winners and meaning of the prize with Kristian Berg Harpviken, who follows the Nobel Committee's process closely and directs the Peace Research Institute in Oslo.

Routine testing of men's blood to detect prostate cancer is unwarranted, and causes more harm than good, according to findings of the U.S. Preventive Services Task Force. The panel of experts sets the agenda for doctors and, increasingly, insurance payments.

There is in the American air — some 13 months away from the 2012 election — a whiff of suggestion that Obama might not be re-elected. Or re-electable. Past presidents have weathered stormier times, but when you hit bottom matters.

Italian leader Silvio Berlusconi is in trouble again, after making an obscene joke at his own ruling party's expense. The quip is the latest in a series of scandals that have nettled the prime minister. And it came at the end of a week that took a deep toll on Italy's economy.

A few weeks ago, dismal economic reports seemed to be pointing to one conclusion: The economy was slipping into another recession. But new data, including Friday's report showing employers added 103,000 jobs in September, suggest the outlook may be somewhat better than many had thought.

Crowds protested in Pakistan's major cities Friday, against the death sentence handed down last week to the self-confessed killer of Punjab provincial Governor Salman Taseer. One of the governor's bodyguards, Mumtaz Qadri, shot him in cold blood outside a café in Islamabad in January.

President Ellen Johnson Sirleaf and Leymah Gbowee of Liberia and Yemeni democracy activist Tawakkul Karman were awarded the 2011 Nobel Peace Prize for their courage in fighting for peace and women's rights.

The infected computers are at Nevada's Creech Air Force Base, where operators control military drones flying over Afghanistan and other areas. So far, at least, the virus has neither hindered remote control of the drones nor funneled classified information elsewhere.