President Obama's performance in the first presidential debate cost him a lot. Chip Somodevilla/Getty Images hide caption

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A new NPR poll shows the outcome of the Nov. 6 election is too close to call. Mitt Romney leads President Obama nationwide; Obama leads Romney in key battleground states. Both leads are within the poll'€™s margin of error. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Libertarian Party presidential nominee Gary Johnson addresses students at Macalester College in St. Paul, Minn., in September. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

Early voting has begun in the battleground states of Ohio, Virginia and Iowa. Voting booths were set up for early voting Thursday at the Black Hawk County Courthouse in Waterloo, Iowa. Ahead of Wednesday's first presidential debate, an NPR poll finds President Obama with a 7-point lead nationally, but his GOP challenger, Mitt Romney, is within striking distance. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images