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.
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?
The eurozone crisis has weighed heavily on the global economy and it will remain a central foreign-policy challenge for President Obama or Mitt Romney, whichever man wins in November. The Obama administration has repeatedly urged eurozone countries to shift their focus from austerity to growth. This week, we're focusing on foreign policy issues facing the next administration.
And NPR's Sylvia Poggioli has this story on the eurozone.