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Federal sentencing punishments are supposed to be predictable. But Republicans in Congress argue that sentences are not consistent, and they're calling for tough new mandatory prison terms. Others say Congress shouldn't take away the discretion that judges have to evaluate each defendant.

The anesthetic and club drug ketamine seems to quickly lift depression symptoms. How does it work? Researchers are searching for the answer in an attempt to make a new class of depression medications.

Colbert said the money was used to "materially influence the elections," just as the founding fathers would have wanted. In its FEC filing, Colbert said his super PAC had more than $673,000 in cash on hand.

Italian rescue crews have recovered 17 bodies, but 16 are still reported missing.

The numbers underscore the Federal Reserve's view that housing remains depressed.

The prolonged procedure of picking a Republican presidential candidate just gets nastier and nastier. One man maligns another; the victim viciously bites back. And everybody piles on President Obama. A look at why this primary season has taken on a noticeably negative chill.

In his annual report on national threats, James Clapper said Iran has the technological capacity to go nuclear, but it's unclear whether it has the political will to do it.

Journalist Joe Hagan says the upcoming election will be "the ugliest campaign ever." He details how superPACs have changed the election game, bringing an unprecedented flood of outside money to fund opposition research and negative ads.

A viral video shows a bunny not afraid to show a flock of sheep who's boss.

ANALYSIS: Despite a sweeping victory, it was not all sweetness and light for Mitt Romney in the Sunshine State. Lacking a hero, many conservatives may have stayed home. Turnout this year was down from the primary of 2008 by 10 percentage points, more than 280,000 votes.