I never said he did. If Obama feels the WPR is un-Constitutional he should come out and say it. Then Congress can do whatever they wish. But until that time it is the law.
I don't like it either, but it is the law until it's either repealed or struck down. That's the simple fact.
The President doesn't have to do what you think the law requires of him. He doesn't even have to do what the Supreme Court thinks the law requires of him. He has to do what he thinks the law requires and what Congress is willing to insist that the law requires. That's exactly what he's doing in this case. Find something else to get hot under the collar about.