In 2008, young voters turned out in droves to elect Barack Obama, but now seem less likely to support his re-election campaign. Some young liberals have even thrown their support behind Republican Ron Paul.
Iowans are preparing to participate in the state's first-in-nation presidential contest. NPR national political correspondent Mara Liasson joins Robert Siegel to talk about Tuesday's Iowa caucuses — how they work and what they might mean.
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