Laura Bush didn't approve of the use of this video clip (which comes from a 2010 interview with Larry King) and she's voiced her objection to it:
Who knows what she secretly thinks, but officially, she's saying you shouldn't have used me without asking. Of course, the group that made the ad — the Respect for Marriage Coalition — has the right to appropriate this clip and use it in their political message. Imagine how hard it would be to make political ads if you couldn't use clips like this. I suspect that secretly she's happy to influence opinion this way — especially as she's able to hold herself at some distance from politics. She clearly likes to seem modest and completely unpushy, as you can see in the longer clip from the Larry King show:
What a terrible shame that the Republican Party didn't accommodate itself to this idea at least 10 years ago. Really, it's a shame they didn't buy in even earlier, 18 years ago, when Andrew Sullivan's "Virtually Normal" came out. At the time, the left-liberals I knew were antagonistic to the institution of marriage and viewed Sullivan's contribution as an unwelcome conservative intrusion on the gay rights movement, which they saw as belonging within a left-wing ideology that transcended traditional institutions. Back in the 90s, I sat through serious, lawyerly presentations aimed at stopping the marriage equality proponents from changing the focus of the movement. There was a wonderful opportunity then for conservatives to embrace the issue, and they missed it.
The Republican Party saw the advantage elsewhere, and now they're stuck with the result.
UPDATE: The Respect for Marriage Coalition withdraws the ad.