Documentation, please, with regard to Sarah Palin?
Santorum-Gingrich animosity dating back to congressional days would not surprise me, though I'd like to see links. People seem to have either loved or hated Gingrich if they were in Congress when he was there. It wasn't only Bill Clinton who accused Gingrich of acting like an “out-of-control radio talk show host” — not realizing that was actually a compliment in the ears of lots of Gingrich supporters.
Rick Santorum’s comments about Sarah Palin go back to the 2008 election, and have occurred as recently the 2011 CPAC.
His comments have been catty and not in the least what one would expect from a gentleman.
But then she did call him a “knuckle-dragging Neanderthal”; yes she did! Quite the love/hate scenario, I’d say.
Suggestion: google “Santorum and Palin”