This is an interesting analysis of Romney's Medicare campaign advertising from Alex Koppelman:
I disagree with this a bit, actually. It is true that they are using this gambit but I think it has little to do with Ryan. In fact, I would imagine they were always planning this ad blitz. After all, it worked very well for them in 2010:
No, they know very well that their only growing demographic is senior citizens and the best wedge they have is those cuts to Medicare providers in Obamacare. This was always the plan.