Romney, Santorum assail each other in Ariz. debate

MESA, Ariz. — Primed for a fight, Mitt Rom­ney and Rick San­to­rum traded fiery accu­sa­tions about health care, spend­ing ear­marks and fed­eral bailouts Wednes­day night in the 20th and pos­si­bly final debate of the roller-coaster race for the Repub­li­can pres­i­den­tial nomination.