The offer was made to move it to Illinois.
Santorum and Romney can't afford to appear at any venue where there are compared to Newt's knowledge and his ability to explain the issues and solutions.
Newt needs to take this ball and run with it.
He needs commercials that mention all the canceled
debates by name and each one showing Newt surrounded
by empty podiums.
Finally have him standing there and saying,
“I’m the last one standing, why would you vote
for anyone else?”.
Rather, there is nothing left to gain from debating Newt again. There is no reward for the risk. That last 12-14% supporting Newt are not likely to be swayed by a debate.