If you listen carefully to his answer,
you’ll hear that he wanted to make sure that he didn’t say that having sex at 12 or 13 was a mistake, but qualified it with “unprotected”.
Obama’s stated, verbalized opinion is that it would be OK, even for his daughters, to have “protected” sex at 12 or 13. To state otherwise would probably be too judgemental for the lefties.
Also notice, conspicuously absent from his response - the “A” word - ADOPTION.
Nor did he acknowledge that the girls parents are often willing and financially able to take care of their grandchild.
Once you get beyond the liberal "nuances" of a baby being a "choice" or a "blob of cells," most parents are not willing to say that they want to kill their own grandchild.