No. 2: U.S. Elections
Mitt Romney outcampaigned an eclectic field of Republican rivals, and bested Obama in their opening head-to-head debate. But on Election Day, thanks in part to a vigorous get-out-the-vote operation, Obama won a second term with a large lead in electoral votes and a solid advantage in popular votes. The GOP hung on to its majority in the House, but lost two seats to remain a minority in the Senate despite early-campaign projections of gains there.
No. 3: Superstorm
As a prelude, the storm named Sandy killed more than 70 people in the Caribbean. Then its high winds and high waters slammed into more than 800 miles of the eastern U.S. seaboard, killing at least 125 more people, and causing damage calculated at well over $60 billion — the second-costliest storm in U.S. history after 2005's Hurricane Katrina. New York and New Jersey were the worst hit, with several hundred thousand homes and businesses damaged or destroyed.
No. 4: Obamacare
By a 5-4 margin, the Supreme Court upheld the core elements of Obama's much-debated health care overhaul, which even he embraced as “Obamacare.” To widespread surprise, the decisive vote came from John Roberts, the generally conservative-leaning chief justice appointed by Republican George W. Bush. Romney, as GOP presidential nominee, vowed to repeal the law if he won, but Obama's victory ensured the plan would proceed, with complex ramifications for insurers, employers, health-care providers and state governments.
No. 5: Libya
Even amid yearlong turmoil in Libya, it was a jarring incident — a Sept. 11 assault in Benghazi, widely blamed on a group with suspected links to al-Qaida, that killed U.S. Ambassador Chris Stephens and three other Americans. The U.S. ambassador to the United Nations, Susan Rice, later bowed out of consideration to be the next secretary of state because of her assertions in TV interviews that a spontaneous demonstration over an anti-Muslim video triggered the attack.