Romney's bad day is Santorum's best in GOP race (AP)

Scores killed in shelling of Syrian city of Homs (AP)

US searches for strategy to halt Syria violence (AP)

Experts: Marriage ban's path to high court unclear (AP)

Mo. teen described as thrill killer by prosecutors (AP)

AP Interview: Homecoming inspires wounded Marine (AP)

Getting caffeine fix as easy as taking deep breath (AP)

House GOP introduces its insider trading bill (AP)

Mrs. Obama beats Fallon in WH fitness challenge (AP)

Wade's 26 helps Heat top Cavs, 107-91 (AP)

Three-state sweep revives Santorum's White House hopes (Reuters)

Greeks seek elusive bailout deal, EU tempers fray (Reuters)

Attacks in Syria's Homs resume after Russian peace foray (Reuters)

Euro, shares higher on hopes for Greek deal (Reuters)

Court overturns California gay marriage ban, appeal planned (Reuters)

Analysis: Romney still struggles to seal the deal (Reuters)

China leader-in-waiting carries heavy political baggage to U.S. (Reuters)

House panel advances Keystone pipeline plan (Reuters)

Prop. 8 struck down: Will California's gay couples flock to the altar? (The Christian Science Monitor)

Why Obama’s flip-flop on super PACs won’t matter (The Christian Science Monitor)