Who is holding the anti-Gingrich spending hammer?

Earlier I posted a piece about how independent spending was directed heavily against Newt Gingrich.  Who is doing it?  Primarily one Super PAC.  In it I noted that $15.9 million was spent against Newt Gingrich.  Digging deeper in Open Secrets, it's interesting to note that $15.7 million of that spending has come from just ONE PAC.

That PAC, Restore Our Future, was responsible for 98.99% of the anti-Gingrich spending.  They've spent more than any other PAC.

Candidate	Party	Office	Total	For	Against
Gingrich, Newt	R	President	$15,746,870	$0	$15,746,870
Romney, Mitt	R	President	$759,227	$759,227	$0
Santorum, Rick	R	President	$396,653	$0	$396,653

The PAC, according to Wikipedia, is one founded by former Romney aides;

Restore Our Future was founded by Romney aides in 2010.[2] Charles Spies, the group's treasurer and former general counsel for Romney's 2008 campaign for the Republican Presidential nomination, described Restore Our Future as "an independent effort focused on getting Romney elected president."[1] The group reported raising over $12 million in the first half of 2011, in the form of large donations from approximately 90 wealthy individuals and corporations.[3] Spies declined to discuss specific contributors to the PAC.[4]

 Thanks to the Citizens United decision, there's nothing illegal about that, as long as the Super PAC does not co-ordinate or communicate with the candidate.  Assuming they are not doing so, they clearly have violated Reagan's 11th Commandment.  They are not alone by any means, but they are far and away the worst offender, and they are in the Mitt Romney camp, along with the Newt-Bashing Bob Dole and John McCain.