Romney clawing his way back in Republican race

Obama urges corporate tax cut, closing loopholes

Taliban urge Afghans to kill "invaders" after Koran burnings

Iran talks failure sparks confrontation fears

Assad forces renew barrage on Syria's Homs

Fitch downgrades Greece on debt swap plan

Analysis: Can U.S. economy withstand gasoline price curse?

Congress members threatened with biological attack

Judge strikes down law mandating sale of contraception

U.S. advisers back experimental obesity pill