Perry is actually winning the electability argument (amongst GOP primary voters), leaving Romney with???
I expect Romney to try to paint Perry as the career politician while pointing out that he (Romney) only spent 4 years in government, which will unfortunately highlight that Romney's track record of winning elections isn't that great, confusing the so-called electability image of Romney.
Not only is Romney's "career politician" attack silly for pointing out how he keeps losing elections. But the other thing is that I think Romney misreads the conservative/tea party mood in that they are more anti-Washington as opposed to anti-politician and Perry is very anti-Washington. Plus the Tea Party are also no fans of Wall Street so I am pretty sure a GOP primary voter will take a Texas Governor over the head of Bain Capital.