Santorum surges but scrutiny intensifies

COLUMBUS — Rick San­to­rum stole a key endorse­ment from chief rival Mitt Rom­ney on Fri­day as polls in Ohio and else­where sug­gest the for­mer Penn­syl­va­nia sen­a­tor has seized the momen­tum in the roller­coaster Repub­li­can pres­i­den­tial contest.