Yes, I think I have seen such a poll, but I'm not sure when or where. Polls tend to be rather meaningless right now. But even if Rudy didn't take NY, Hillary would still have to spend more time and money defending it than she would otherwise. Moreover, I think NJ would also fall in Rudy's camp.
The mayor needs to get out on the stump and make a few major policy speeches. He has people guessing and projecting where he stands on important Republican issues. He should do so on three topics:
1) Abortion
2) The 2nd amendment
3) Appointing judges
There are probably other issues he should address that others want to hear. I think his advisors are timid, afraid to offend some group.
Reagan, in the 1980 campaign, traveled all over the country laying out his beliefs. No reason Guilianni can't do that.
I don't know where he stands, other than reading what his supporters and detracters write. He can erase all doubt by telling us with his own words.