I'll say it again: this is the pick both sides thought they wanted. And yes politicians work without a net and the best of them will have their off days. But you can be Paul Ryan will have a lot more days like today than he will off days. The default liberal attack on conservatives is to try to paint them as stupid. Good luck with that with Paul Ryan.
Okay, so the other option is to try to define him as uncaring, devoid of compassion. That will also clash with reality. The ultimate "be careful what you wish for."