I have to imagine that Romney and the "establishment" has actually pressured Gingrich to stay in the race. That seems to be the only way to avoid a brokered convention. As an aside, Gingrich's promise of $2.50/gallon is absurd. At most, he could remove the fuel tax and lower prices by 18 cents. There is no guaranty that would even be passed on at the pump - the oil companies could simply absorb that savings as profit.
Any new drilling would take years to have an effect, and even then, it would be minimal.
From Yahoo's coverage:
Contested convention is Gingrich’s last hope | The Ticket - Yahoo! News: " Voters will realize Gingrich is Obama's biggest fear: National head-to-head polling may not bear this out, but Gingrich contends that he's the strongest candidate to take on President Obama. He uses his new pledge to lower gas to $2.50 per gallon as the most recent example of his ability to influence the White House, even from his current unofficial position. "The White House is clearly on the defensive," his campaign wrote Wednesday. Gingrich believes his campaign of "solutions" and "big ideas" will lead him to outlast and defeat opponents."
'via Blog this'