Twenty-five percent say they would be less willing to vote for him, and 18% say they would rule out voting for him entirely.
No Tommy, let me try again. That refers to the entire sample. I tried to explain to you why I don't see the answers from the entire sample as particularly relevant.
You have to read further down the article to get the data on the subsample of Rudy supporters. That is what you really want to know. What percentage of his supporters would he lose. Not how many of McCain's supporters does he lose, which is reflected in the numbers you quote.
In this poll Rudy loses 10% of his supporters, and a quarter say they would be less likely to vote for him--not that they would refuse to do so.