Weigel thinks so:
Romney’s campaign had outspent Newt Gingrich’s campaign by a 7-2 margin and outspent Rick Santorum’s by a 19-1 margin. According to the Sunlight Foundation, which has tracked the super PACs all year, the Romney-centric Restore Our Future PAC outspent the pro-Gingrich Winning Our Future PAC only 2-1. It outspent the Santorum-philic Red, White and Blue fund by slightly better than 8-1, which was just what the PAC needed to spend to get its candidate into an Iowa tie.
"Take away the super PACs, and Santorum would have probably had to drop out after Iowa," says Bill Allison, editorial director of the Sunlight Foundation. "Gingrich might have had to drop out after South Carolina."
The Dish 