I think this polling change may be more of a course-correct than a bump. He was sagging disproportionately and is now polling where he objectively should be. Well, as objectively as you can in such an obnoxiously unrealistic and dishonest Presidential shet-show of a campaign. Romney should be within one or two points of Obama considering the current climate.
Romney did not change. All that he did was to repackage himself and deny earlier positions. He has done that before, and he has typically faded soon afterward.