From this:
...The steps Monday put Giuliani on the same level legally as McCain and Romney, the other top-tier GOP candidates who have formed regular exploratory committees and filed statements of candidacy.
Giuliani's cautious and noncommittal attitude has caused some critics to question whether he would abandon his bid even before formally entering the race, as he did in 2000 when he was considering a Senate campaign against Democrat Hillary Rodham Clinton.
Fighting back in recent weeks, Giuliani has started to sound and act like a strong contender, traveling to the early primary states of New Hampshire and South Carolina, and arguing that his vision for the future and performance in the past would make him a formidable GOP nominee.
Still, he has stopped short of committing to a run, insisting that he has to decide whether he can make a "unique contribution" to help strengthen the country -- his barometer for whether to run...
Considering that his immigration positions are somewhere around the same as president Bush's, one "unique contribution" he could make would be to support our laws.