His number is up from last week, but is still down from last month and his favorability rating was unchanged from last week. That too is down from his high of 71%.
His numbers have stagnated or declined since March. Just for a little context, in 1999 Bush went over 40% in February, over 50% in May and over 60% in June. In May of 1999 Elizabeth Dole was polling 24%. Giuliani's support is closer to Elizabeth Dole than George Bush at the same point in the cycle.
Even if he somehow manages to get the nomination I fail to see any reason for rejoicing by his supporters. If he squeaks through the primary process by winning a plurality of votes and his support continues to sag or stagnate do you honestly believe he would have the slightest chance of winning the general election?
Did you ever think that the reason why there are so very low poll numbers for everyone is that there are so many candidates. Once the candidates start dropping out the poll numbers will go up for everyone left in the primary race. There are at least 11 people in the race (including the non-candidates).