'Look, I've told my supporters, this is the most important election of our lifetime,' Gingrich said. The casino mogul recently did just that, giving $10 million to the pro-Romney group Restore Our Future - the single largest contribution, by far, to the group. Now Gingrich says he has encouraged Adelson to give generously to Romney. 'In the end, he had, I think, sixteen billionaires and we had one,' Gingrich said. Gingrich attributed his own loss in the Republican primary to Romney's overwhelming financial advantage. 'The trick is not to cripple the rich, the trick is to empower the middle class.' 'We're in a situation where if you're really rich, you have an enormous, and I think unfair, advantage,' Gingrich told us. Hurling attacks at Romney would have been difficult for Gingrich's cash-strapped campaign were it not for the help of a SuperPAC backed by billionaire casino magnate Sheldon Adelson, who along with his wife gave some $25 million to the pro-Gingrich Super PAC that ran viscously negative ads. 'They're legitimate questions you can ask, and I think you should be able to ask about anybody, whether it's Newt Gingrich or Mitt Romney or, you know, Rick Santorum, or, you know, anybody who's running for president,' said Gingrich. Gingrich defended the harsh attack ads against Romney's record at Bain Capital released by a SuperPAC supporting the former speaker. I threw the kitchen sink at him, he threw a bigger kitchen sink at me,' said Gingrich. 'It was a very tough primary, and we fought each other. When Romney was his foe during the primary battle, however, Gingrich called him a liar and a Massachusetts moderate - attacks he maintains did not go over the line.

But if Romney stays on offense, Gingrich argued, Obama could lose by a 'surprising margin.' Romney's 'biggest weakness is gonna be the tendency of the consultants to say play it safe,' warned Gingrich.

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