Here is Santorum on the Romney firing comment, which he criticizes but without debasing himself. (He does, however, go hard negative against left-handers.)

UPDATE:

An e-mail:

Rich:
This is the expected (invited?) pushback from a left-hander: Where do I go to get my dignity back? Why are my sensitivities ignored, trampled upon, disdained? Am I a mere potted plant (sincerest apologies to the potted plants among your devoted readership)? No, I have feelings, too.
It’s too late in the New Hampshire primary to start a blog, put up a website, publish a You Tube video, take out an ad in the Manchester Union Leader. I ask you—I beg you—to confront Rick Santorum on the campaign trail. Ask him what he has to say to left-handed Republicans everywhere who plan to vote in the upcoming primaries. Until now we viewed him as our champion, our advocate. No more…