(CNN) - It seemed like a safe assumption: National security stalwart John McCain would win among voters most concerned about terrorism while former business executive Mitt Romney would score with those worried about the economy.
But exit polls suggest just the opposite occurred.
Despite Romney's aggressive effort to portray himself as strong on economic issues - and at the same time claim McCain lacked any grasp of the issue - the Arizona senator actually edged out Romney (38-32 percent) among the 45 percent of Florida Republican primary voters who said the economy was the their main concern.
And despite McCain's effort to put national security issues back in the dialogue - and paint Romney as a flip-flopper on the war in Iraq - Romney edged out McCain (29 to 24 percent) among the 21 percent of voters most concerned with terrorism.
Rudy Giuliani, the former New York City mayor who based the majority of his campaign against facing the terrorist threat, also fared well with voters concerned with terrorism, winning 27 percent of them.
But Romney and McCain did safely win with two specific demographics they were targeting. Among the 16 percent most concerned illegal immigration, Romney bested McCain by 10 points, and among the 14 percent of voters most concerned with the War in Iraq, McCain beat Romney by 25 points.
- CNN Producer Alexander Mooney