NEW YORK — Rudolph Giuliani, whose endorsement of Michael Bloomberg after the Sept. 11 attacks is viewed as a key factor in the political novice’s eventual upset victory in the New York City mayor’s race, has been used sparingly on this year’s campaign trail even though he has endorsed a former aide.
That may not be an accident. Although Giuliani’s popularity was high in New York City for much of his tenure and soared here and beyond as ‘‘America’s mayor’’ for his response to the 2001 attacks, that’s no longer the case.
Appearing on the campaign trail could hurt his former deputy mayor and budget director, Joe Lhota, as much as help him, observers say. Full story for BostonGlobe.com subscribers.