From NPR News, this is ALL THINGS CONSIDERED. I'm Audie Cornish.
MELISSA BLOCK, HOST:
And I'm Melissa Block.
It's the third day of the teachers' strike in Chicago. For the first time in 25 years, teachers are on the picket line and 350,000 students are out of class. The strike poses a unique challenge for Chicago's Mayor Rahm Emanuel. That's because he's also one of President Obama's top fund-raisers and surrogates.
We turn now to Washington for more reaction to this brazen attack. The Obama administration is sending a Marine anti-terrorism unit to bolster security in Libya. It's also taking precautions elsewhere. The stepped up security comes as the State Department mourns its losses. NPR's Michele Kelemen has that story.
MICHELE KELEMEN, BYLINE: Shock and sadness hovered over the State Department as Secretary of State Hillary Clinton spoke of the devastating losses of four foreign service personnel.
This morning, Secretary of State Hillary Clinton said this about the slain ambassador, Christopher Stevens.
SECRETARY HILLARY CLINTON: He risked his life to stop a tyrant, then gave his life trying to help build a better Libya. The world needs more Chris Stevenses.
BLOCK: Earlier this year, before Chris Stevens assumed his position as ambassador to Libya, he made a video, subtitled in Arabic, directed to the Libyan people. It was posted on the U.S. Embassy's website and on YouTube.
Every election season Republicans and Democrats tried to rally their base and to go after undecided voters. They're increasingly using the Internet in Get Out The Vote efforts.
NPR correspondent Shankar Vedantam, who reports on social science research, joins me now to talk about how Facebook could become a potent weapon in going after the biggest untapped voting bloc in the nation. Shankar, welcome.
SHANKAR VEDANTAM, BYLINE: Hi, Melissa.
BLOCK: Who are these mystery voters, this untapped voting bloc that we mentioned?
This is ALL THINGS CONSIDERED from NPR News. I'm Melissa Block.
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Thousands gathered today at the World Trade Center site in New York. They marked the 11th anniversary of the September 11th terror attacks. Family members of the victims took turns reading the names of the nearly 3,000 people who died in New York, Washington and Shanksville, Pennsylvania.