Brownback v. Romney

I guess I agree with Josh Marshall that Sam Brownback's video questioning Mitt Romney's bona fides on "life" issues is pretty effective:

That said, I wonder how convincing any pro-life voters are really going to find this whole line of attack. What's the specific concern about Romney's evident lack of genuine principles on these issues? He seems to me to be eminently willing to govern as a pro-lifer in terms of his judicial appointments which seems to me to be 90 percent of what's at stake here. It's true that his explanation of his position doesn't make a ton of sense, but these constitutional amendments and so forth aren't going to be enacted anyway so who really cares?