(CNN) - John McCain appears to owe Rudy Giuliani a big thank you.
Our exit polls show the former New York City mayor's endorsement of McCain played a key factor in his win there. Over half of New York Republicans said Giuliani's endorsement was important, and those voters went to McCain over Romney 63 percent to 22 percent. (Romney beat McCain by 47 percent to 29 percent among those voters who said Giuliani's endorsement was not important.)
The exit polls also indicate McCain inherited Giuliani's key voting bloc - those who are chiefly concerned with terrorism. Roughly half those voters went to McCain while only a third went to Romney.
And there's another interesting finding out of New York: McCain beat Romney among conservatives there - bucking the trend seen nationally and in other states. Forty-six percent of conservatives chose McCain while 37 percent went for Romney.
–CNN Senior Political Analyst Bill Schneider