Who knows what combination of factors convinced him. But among them must have been the knowledge that starting the very day he became a candidate, news coverage and general buzz would switch from all the assets he would bring to a race, as the highly sought-after savior-candidate, to all the defects, heresies, and vulnerabilities he has relative to other contenders and as a potential Commander in Chief. If he had any trouble imagining that in theory, he has the past two months of Rick Perry's life as an object lesson.
As I tried to argue a week ago, barring asteroid strike or its political counterpart, the Republican field is in fact set, and Mitt Romney plods steadily ahead. Things change in politics, but at this stage in a race they don't change via the appearance of out-of-the-blue plausible new entries. Romney, Perry, Cain, et al: it's up to you.
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