A federal appeals court in San Francisco has begun grappling with the constitutionality of Arizona's abortion law, which is considered the most restrictive in the country as it prohibits abortion after the 20th week of pregnancy.
President Barack Obama said he will work across party lines to end gridlock in Washington by compromising but not surrendering. Mitt Romney renewed his pledge to work with Democrats on Capitol Hill if elected, but at the same time promised to overturn Democrats' signature achievements.
Scientists say initial sampling of Mars' atmosphere by the NASA rover Curiosity did not definitively detect methane, a gas that can be a clue to determining if the red planet ever was hospitable to microbial life.
The Obama administration is ordering the purchase of up to 12 million gallons of unleaded fuel and up to 10 million gallons of diesel fuel for distribution in areas impacted by Superstorm Sandy to supplement private sector efforts.