You don’t fall back to anywhere, because the media induced surge of Santorum was designed specifically to ensure Romney the nomination.
*sigh*
My take is a bit different. Santorum surged due to Gingrich flatlining. Gingrich flatlined for 2 reasons in my mind: (1) He had no money to fight back, (2) he’d bought that bill of goods that says fighting back is counter-productive.
So, the shift to Santorum was a logical shift. Perry could also have been a shift, but he’d played that same stupid game as Gingrich had. Refusal to fight back.
The game Bush played about everything from WMDs to Who Brought down the WTC Towers....and that Cheney says was their critical mistake.
The game that McCain played and got taken to the cleaners with Sarah Palin screaming common sense all the way and not being heard.
The hope is that Santorum has some muscle and will retaliate.