Poll: 47 percent concerned McCain wouldn't finish first term

(CNN) -- It's one of the largest age gaps between presidential candidates in American history. Republican Sen. John McCain is 72, a skin cancer survivor, and would be the oldest man sworn in for a first term as president. His opponent, Democratic Sen. Barack Obama, is 47 and the fourth-youngest major party nominee.

A new CNN/Opinion Research Corp. Poll finds that may be a political liability for McCain. Nearly half of the Americans surveyed, 47 percent, are concerned that McCain would not finish a four-year term as president in good health.

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