Sometimes when you make something like a logo you convey more than you intend. From the very begining of the Presidential campaign the star has been at the center of the McCain iconography. The star has a special significance in McCain's life. McCain's father and grandfather where both four star admirals. John McCain never became and admiral and therfore never recieved an admiral's star.
John McCain was viewed as rebel in the navy, which wasn't good for his career. He never seemed to have career advancement as a primary goal. It is hard to say how his long captivity and brutal torture affectected his career plans. He may have taken his navy career more serously if these events had not transpired and political career not beckoned. But for better or worse he did not fufill the family ambition of having three four star admirals.
The star in his logo hints at underlying search for redemption. If he becomes President than it will be better than becoming a four star admiral. Instead of a career slacker he will be a triumphant comander and chief. We all saw how Bush's desire to distance himself from his father egged him on to making disasterous policy decisions. It would be unwise to elect another politician that seems to have similar father issues.