Newt Gingrich has often responded best when at his lowest points in a campaign that has seen his prospects plummet more than once.
He's down in the polls again, and Wednesday night's CNN debate in Mesa, Ariz., will offer him another chance to use adversity as political fuel.
The latest Republican presidential faceoff also will be key for Mitt Romney, whose political life on the line, and Rick Santorum will face his first test in the spotlight as a bona fide front-runner.
But for Gingrich, who has fallen almost 20 points behind Santorum in the latest RCP average of national polls,…
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