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President Obama won re-election despite an economy struggling to recover from recession and deep reservations about his signature first-term achievement, the nation's new health care law.

NPR's Liz Halloran explained how Obama's campaign organization helped him overcome these and other challenges. Here, NPR reporters have more about his challenges and successes in the areas of the economy, national security, energy and health care:

Transcript of Mitt Romney's concession speech in the presidential race in Boston. Source: Federal News Service

Editor's Note: NPR transcripts are created on a rush deadline by a contractor for NPR, and accuracy and availability may vary. This text may not be in its final form and may be updated or revised in the future.

(Cheers, applause.)

MITT ROMNEY: Thank you. Thank you. Thank you, my friends. Thank you so very much. Thank you. (Cheers, applause.) Thank you. Thank you.

The battle to control the Senate was a proving ground for the new Citizens United politics. Outside groups unleashed heavily funded barrages of attack ads meant to help elect candidates while letting them keep their distance from the nastiness.

In Ohio and Virginia, the tactic failed in rather dramatic ways, as Republicans backed by secretly financed ads failed to beat seemingly vulnerable Democrats.

Robert Siegel talks with Debbie Elliott as polls close in Florida.

Melissa Block talks to Andrew Kohut of the Pew Research Center about early exit poll results.

Melissa Block talks with Don Gonyea as polls close in Ohio.

Robert Siegel talks with Ron Elving about the big picture of Tuesday's elections.

Melissa Block talks with Pam Fessler about voting issues that arose on Tuesday.

The aftermath of Superstorm Sandy has complicated voting in the New York City area. Robert Siegel talks with Robert Smith.

Melissa Block talks with Tamara Keith in Ohio.