Romney and Santorum seek edge in 20th debate (AP)

Poll: Obama benefitting from improving economy (AP)

Shelling kills 2 Western journalists in Syria (AP)

Newark mayor: NYPD Muslim files 'deeply offensive' (AP)

Police: Ga. victims related in Korean spa shooting (AP)

Obama seeks corporate tax rate cut, loophole limit (AP)

Teenage girl dies after inhaling helium at party (AP)

Stepmom, grandmother charged in Ala. girl's death (AP)

Study: Colonoscopy cuts colon cancer death risk (AP)

Man's childhood comic collection fetches $3.5M (AP)

Obama urges corporate tax cut, closing loopholes (Reuters)

U.S., French journalists killed in Syria (Reuters)

Fitch downgrades Greece on debt swap plan (Reuters)

Congress members threatened with biological attack (Reuters)

Judge strikes down law mandating sale of contraception (Reuters)

Home resales at 1-1/2 year-high, supply falls (Reuters)

Iran defiant as U.N. nuclear talks fail (Reuters)

U.S. advisers back experimental obesity pill (Reuters)

Could Rick Santorum super PAC do more harm than good? (The Christian Science Monitor)

Stolen Valor Act at Supreme Court: Is lying about being a hero a right? (The Christian Science Monitor)