"Happy to" is commonly interchanged with "willing to".
Perhaps it was a poor choice of words.
He is still a hard core abortion supporter, and thinks that stabbing a baby in the head and sucking his brains out is perfectly acceptable, since he said he would not support a partial birth abortion ban. (And don't give me the old it was because there was no "life of the mother" clause mantra. That has been disproven.)
Rudy's not shying away from his position.
The bottom line for me is that I don't think it's a relevant issue at the Presidential level. We'll never win the abortion fight in that arena.