“How Would Santorum Do Without Gingrich”
I’ll ask the same question only in reverse. :)
Ohio
Romney 38%
Santorum 37%
Gingrich 15%
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How many Gingrich votes would have gone to each: Romney and Santorum?
In all probability, Ohio would have turned out to be a big win for Santorum without Gingrich in the race. That could have off-set the walk-away Romney got in Virginia.