>> More would go to Newt than would go to Romney, which would be a net gain for Newt.
There was a poll to that effect posted here not too long ago. If I remember correctly, Santorum’s supporters split 60:40 in favor of Gingrich over Romney.
I’ll try to find the link.
Found mention in a PPP poll from 1/23:
2) If Rick Santorum drops out between now and next Tuesday, Gingrich will be the beneficiary. His voters prefer Gingrich over Romney 50-23, and in a field where he’s no longer a candidate Newt’s lead expands to 43-36.
So the split isn’t 60:40 Gingrich:Romney, it’s 2:1!
http://www.publicpolicypolling.com/
Scroll about 2/3 of the way down; it’s under the “Newt up 5 in florida” heading.