The "personally opposed" argument revisited

Here is David Blankenhorn on Catholic politicians, such as John Kerry and Mario Cuomo, who assert that they are personally opposed to abortion but do everything to facilitate it legally in their public lives:

What if they told us that they "personally" believed in clean air and in corporations doing more to reduce air pollution, but that since that is a "religious" belief -- remember all those Bible verses about being good stewards? -- they in fact, as a matter of actual politics and policy, have absolutely nothing to say regarding corporate-generated air pollutants and toxic wastes. We would laugh at them if they said that.

It seems to me that Sen. Kerry's position on abortion is very clear. He's solidly, firmly pro-choice. In my view that is an honorable position. But Sen. Kerry, please spare us the part about how you actually hold the opposite position "personally" but are only pro-choice because the separation of church and state requires you to be.