This particular story is likely intended to remind voters that McCain had an affair during his first marriage, and possibly raise a suspicion he may have repeated his earlier behavior.
McCain’s voting record has already received much scrutiny within the Republican Party.
McCain's age and health will be the next major news stories regarding his personal life. Separately, they wouldn't carry much weight with voters. Combined, they could be devastating.
I think IF McCain plays it right there can be a backlash against the media and dems for these stories. He has a good reputation at the moment, which they are trying to deconstruct, and he needs to do something similar to what Obama does when he deflects criticisms as his opponent playing the race card.
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Politico.com
McCain appears in poor health and lacking in vigor. I saw Cindy help him off the plane. He speaks as if about to take a nap. He looks (and moves) much older than his years.