He has called for its repeal.
Period.
I don't know what Walker says he'd do about Obamacare. I looked, and didn't seen anything, but I didn't look that hard. So far, it seems he's displeased with it. But I haven't seen him outright calling for its full repeal. I have seen Cruz doing that.
I am fully aware that Cruz wants it repealed though, good to point out.