Now for the goodies. Laying the backstory:

McCain likes to illustrate his moral fibre by referring to his five years as a prisoner-of-war in Vietnam. And to demonstrate his commitment to family values, the 71-year-old former US Navy pilot pays warm tribute to his beautiful blonde wife, Cindy, with whom he has four children.

But there is another Mrs McCain who casts a ghostly shadow over the Senator’s presidential campaign. She is seldom seen and rarely written about, despite being mother to McCain’s three eldest children.

The meat:

She was the woman McCain dreamed of during his long incarceration and torture in Vietnam’s infamous ‘Hanoi Hilton’ prison and the woman who faithfully stayed at home looking after the children and waiting anxiously for news.

But when McCain returned to America in 1973 to a fanfare of publicity and a handshake from Richard Nixon, he discovered his wife had been disfigured in a terrible car crash three years earlier. Her car had skidded on icy roads into a telegraph pole on Christmas Eve, 1969. Her pelvis and one arm were shattered by the impact and she suffered massive internal injuries.

When Carol was discharged from hospital after six months of life-saving surgery, the prognosis was bleak. In order to save her legs, surgeons had been forced to cut away huge sections of shattered bone, taking with it her tall, willowy figure. She was confined to a wheelchair and was forced to use a catheter.

Through sheer hard work, Carol learned to walk again. But when John McCain came home from Vietnam, she had gained a lot of weight and bore little resemblance to her old self. Today, she stands at just 5ft4in and still walks awkwardly, with a pronounced limp. Her body is held together by screws and metal plates and, at 70, her face is worn by wrinkles that speak of decades of silent suffering.

McCain divorced Carol in 1980 and married Cindy one month later. Carol's version:

My accident is well recorded. I had 23 operations, I am five inches shorter than I used to be and I was in hospital for six months. It was just awful, but it wasn’t the reason for my divorce. ‘My marriage ended because John McCain didn’t want to be 40, he wanted to be 25. You know that happens...it just does.’

Others are less charitable:

Some of McCain’s acquaintances ... portray the politician as a self-centred womaniser who effectively abandoned his crippled wife to ‘play the field’. They accuse him of finally settling on Cindy, a former rodeo beauty queen, for financial reasons.

....friends say privately he was ‘appalled’ by the change in her appearance. At first, though, he was kind, assuring her: ‘I don’t look so good myself. It’s fine.’

....A sympathetic Nancy Reagan took Carol under her wing.

But already the McCains’ marriage had begun to fray. ‘John started carousing and running around with women,’ said Robert Timberg. McCain has acknowledged that he had girlfriends during this time, without going into details. Some friends blame his dissatisfaction with Carol, but others give some credence to her theory of a mid-life crisis.

McCain (and Cindy) have taken good care of Carol:

Friends confirm she has remained friends with McCain and backed him in all his campaigns. ‘He was very generous to her in the divorce but of course he could afford to be, since he was marrying Cindy,’ one observed.

It may be enough for Carol, who indeed is supporting McCain's campaign this year as she has his past campaigns. It's not enough for this man:

Ted Sampley, who fought with US Special Forces in Vietnam and is now a leading campaigner for veterans’ rights, said: ‘I have been following John McCain’s career for nearly 20 years. I know him personally. There is something wrong with this guy and let me tell you what it is – deceit.

‘When he came home and saw that Carol was not the beauty he left behind, he started running around on her almost right away. Everybody around him knew it. ‘Eventually he met Cindy and she was young and beautiful and very wealthy. At that point McCain just dumped Carol for something he thought was better.

‘This is a guy who makes such a big deal about his character. He has no character. He is a fake. If there was any character in that first marriage, it all belonged to Carol.’

Keep in mind this is a UK paper, which views the presidential race rather theatrically:

While Obama will surely press his credentials as the embodiment of the American dream – a handsome, charismatic young black man who was raised on food stamps by a single mother and who represents his country’s future – McCain will present himself as a selfless, principled war hero whose campaign represents not so much a battle for the presidency of the United States, but a crusade to rescue the nation’s tarnished reputation.

So, water under the bridge? Or will the thought of a man who leaves the disfigured wife who raised his kids for a younger, rich woman be a turn-off for women voters?