The story

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.

To pre-empt those concerns, McCain has allowed reporters -- including CNN chief medical correspondent Dr. Sanjay Gupta -- to look through more than 1,100 pages of his medical records. This spring, McCain's personal physician, Dr. John Eckstein, released a letter saying there is no medical reason "that would preclude McCain from fulfilling all the duties and obligations of the president of the United States."

Still, the issue hasn't gone away in the minds of voters. Read full article »

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