In the last minute you can catch Peter Wehner pulling something really slippery.
"I would dispute that explaining the rationale for the policy is putting somebody in a box"
Of course it wouldn't, but Peter here is complaining that politicians won't explain their personal
views on abortion (why they "personally" believe abortion is wrong), not their policy
views. And that's where the boxing in lies--people might have a variety of views on abortion and still agree that sticking the messy hands of government into the bodies of women in desperate situations simply won't end well. The specific reasons why abortion is or isn't wrong just don't enter into the "safe, legal, rare" argument. Insisting that politicians step out and air their personal views would only divide us where no division is necessary.
For example, some people might want to feed the poor because they're humanitarians, and some people might want to because they're Christians. They can either agree on the policy and be happy, or they can spend time fighting over whose reason is the right reason.