COLUMBUS, Ohio (AP) - Rick Santorum has grabbed a key endorsement from chief rival Mitt Romney as polls in Ohio and elsewhere suggest the former Pennsylvania senator has the momentum in the rollercoaster Republican presidential contest.
Amid the shift, however, are signs of stress within a disorganized Santorum campaign and intensifying questions aboutwhether he can sustain a rise that has come and gone once before already.
Romney's mammoth political machine - coupled with new scrutiny - is giving Santorum little margin for error. Santorum was all smiles Friday at the Ohio State House as state
Attorney General Mike DeWine formally shifted his allegiance from Romney to Santorum. DeWine's about-face comes just 18 days before Ohio and nine other states host critical Super Tuesday contests.
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